Graph a piecewise function and its derivative. Piecewise expressions (using restriction notation in curly braces) allow selecting between different actions depending on a condition. Desmos Art: The Definitive Guide to Computational …. Graphing Piecewise Functions using Desmos Show more. Piecewise Function Practice • Activity Builder by Desmos. The completed Lambert W function. Referencing a piecewise function in another function in. Piece wise functions in Desmos are defined by typing in f ( x) = { C 1: D 1, C 2: D 2, … } where C i is a condition like x < 1 2 and D i is a definition for the range of values described by C i, like / x − 1 2 /. From piecewise functions and implicit relations, to including sliders within your restrictions, Desmos makes it easy to control what you see in the coordinate plane. The Desmos calculator supports piecewise functions such as {x<5 : 0, 1} or {x<=5 : 0, 1} Share Cite Follow edited Apr 13, 2017 at 12:19 community wiki 4 revs user147263 1 Are you saying s i g n ( 0) = 1? If not, then your answer doesnt work. Desmos and piecewise functions>Intro to Desmos and piecewise functions. Each piece behaves differently based on the input function for that interval. In this activity, students use piecewise functions to match graphs of rays and segments, interpret function values in a graphical context, and apply what they learn to a postage rates problem. Hi everyone, I’m currently trying to graph a piecewise function in Desmos, but I’m not quite sure how to do it. Piecewise Function Example. Piecewise Linear Functions • Teacher Guide. We use piecewise functions to describe situations in which a rule or relationship changes as the input value crosses certain “boundaries. Piecewise Continuous Function A piecewise continuous function is continuous except for a certain number of points. The graph of a piecewise function has different pieces corresponding to each of its definitions. Loading Graphing Piecewise Functions. As with other functions, a piecewise function can also be given a name by simply replacing the leftmost variable with the name of the function. This worksheet will help with Piecewise functions. Piecewise expressions (using restriction notation in curly braces) allow selecting between different actions depending on a condition. Graph a piecewise function and its derivative. Limiting the domain and range on the Desmos graphing calculator is simple. Here is an activity to allow students to practice writing functions from given graphs with restricted domains. We can graph a piecewise function by graphing each individual piece. Statistics: 4th Order Polynomial. Use function notation to make meaningful connections between expressions, tables, and other mathematical objects. I’ve tried entering it as two separate functions, but that doesn’t seem to work. 7; it uses self-checking questions to practice writing equations for piecewise functions and using function notation. ago So in this case itd be f (x)=√ (x+12) viscorgi • 3 yr. Because each of the pieces in this definition is constant, the function V is called a piecewise constant function. Hi everyone, I’m currently trying to graph a piecewise function in Desmos, but I’m not quite sure how to do it. Piecewise Function Example. Piecewise Linear Functions • Activity Builder by Desmos. I’ve tried entering it as two separate functions, but that doesn’t seem to work. For example, we can make a piecewise function f (x) where f (x) = -9 when -9 < x ≤ -5, f (x) = 6 when -5 < x ≤ -1, and f (x) = -7 when -1 Questions Tips & Thanks Sort by: Top Voted Marko Arezina 8 years ago. Get started with the video on the right, then dive deeper with the resources and challenges below. Graphing Piecewise Functions. Emphasis on f(x)=a/x-h/+k Exploring Absolute Value Functions • Activity Builder by Desmos. Step 1: Initial Setup — Source Picture Step 2: Divide and Conquer Step 3: Portion Crunching Step 3a: Drawing Curves Modeling Line Segments Modeling Circular/Elliptical Segments Modeling Other Curvy Segments Subdividing Curve Segments Curve Trimming Step 3b: Coloring Regions Portion Crunching in Action: Antenna & Hat Step 4: More Portion Crunching. From piecewise functions and implicit relations, to including sliders within your restrictions, Desmos makes it easy to control what you see in the coordinate plane. This Math Monday, fall in love with Desmos as we explore the activity Piecewise Functions: Introducing Marginal and Effective Income Tax Rates. This video explains how to graph a piecewie defined using desmos. Getting Started: Inequalities and Restrictions – Desmos Help. Conic Sections: Ellipse with Foci. Intro to Desmos and piecewise functions Transformations: Inverse of a Function. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. 44K subscribers Subscribe 17K views 8 years ago An example of how to create piece-wise defined functions with Desmos for your future. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. Watch this quick tutorial to learn how:. If someone could make one and send me the link it would be much appreciated! Due Tomorrow $50 Per Month buys 400 mins. For example, suppose I had the following: $$ f(x) = //left//{ //begin{array}{ll} /x+. 68K views 8 years ago Desmos Tutorials. Let us see why is it called so. A piecewise function is a function that is defined in separate pieces or intervals. Piecewise functions with Desmos David Dobervich 4. f (y) =x is how you graph the true inverse 1 more reply luckybutlonelybryan • 1 yr. piecewise function in another function in >Referencing a piecewise function in another function in. Piecewise Function Example. I needed to create a piecewise function, and then graph it based on two cell phone plans. Graphing Calculator: Essential Skills. Piecewise Function Practice • Activity Builder by Desmos. To start, you’ll need some data in a table. This activity can be used to introduce students to absolute value functions and the transformation of functions. I have created the function but need help graphing them on desmos. Use custom colors to go beyond the default Desmos palette and add a personal touch to your graphs! You can define colors using hue, saturation, and value parameters (HSV); or by specifying the amounts of red, green, and blue in the color (RGB). You can do things like decrement a a, but only if it is positive. Piecewise Linear Functions • Activity Builder by Desmos. Custom Colors – Desmos Help Center. Desmos Art: Definitive Guide to Computational Sketching >Desmos Art: Definitive Guide to Computational Sketching. Graph of Piecewise functions – GeoGebra>Graph of Piecewise functions – GeoGebra. Learn Desmos: Restrictions. If what you want is just a function that in one single expression plots two functions then you just need a list of functions. A piecewise function is actually made up of “pieces” of different functions. Limiting the domain and range on the Desmos graphing calculator is simple. Once you’ve mastered this feature you’ll be cranking out incredible graph art in no time. Get started with the video on the right, then dive deeper with the resources and challenges below. Learn how to sketch graphs of piecewise functions using Desmos graphing calculator through solved examples mentioned in my article. Conic Sections: Parabola and Focus. Piecewise functions with Desmos David Dobervich 4. They begin with an informal exploration of domain and range using a graph, and build up to representing the domain and range of piecewise functions using inequalities. 42K subscribers Subscribe 707 views 2 years ago MAT 2 Business Calc In this video we will look at how to graph a piecewise function using. Conic Sections: Ellipse with Foci. Graphing a Piecewise function using Desmos I needed to create a piecewise function, and then graph it based on two cell phone plans. A piecewise function is a function in which more than one formula is used to define the output over different pieces of the domain. For example, for t = − 1, t = − 10, and t = − 100. Learn how to sketch graphs of piecewise functions using Desmos graphing calculator through solved examples mentioned in my article. A piecewise function is a function made up of different parts. obtain a piecewise periodic function? : r/desmos. A piecewise function is a function in which more than one formula is used to define the output over different pieces of the domain. A couple days ago, I had posted a formula that could be used for all branches of the Lambert W function except at the interval [-1/e,0]. From piecewise functions and implicit relations, to including sliders within your restrictions, Desmos makes it easy to control what you see in the coordinate plane. The Desmos calculator supports piecewise functions such as {x<5 : 0, 1} or {x<=5 : 0, 1} Share Cite Follow edited Apr 13, 2017 at 12:19 community wiki 4 revs user147263 1 Are you saying s i g n ( 0) = 1? If not, then your answer doesnt work. Unfortunately, you cannot graph an inequality of: -1 < x < 4, GeoGebra cant quite do that yet. This way, we can recycle the function repeatedly without having to redefine it ever again. This Desmos activity corresponds to Level 1 of Application FA-1. Piecewise Functions on Desmos - YouTube 0:00 / 4:36 Piecewise Functions on Desmos MrDaveblev 1. Contents Introduction Evaluating Piecewise Functions Graphing Piecewise Functions Introduction Piecewise functions can be split into as many pieces as necessary. 42K subscribers Subscribe 707 views 2 years ago MAT 2 Business Calc In this video we will look at how to graph a piecewise function using. 30 per min $60 per month buys 450 mins. How to create your name on Desmos using parent functions. This is also a great way to graph shapes in the calculator. Graphing Piecewise Functions. Math Monday: Piecewise Functions, Marginal and. Piecewise Functions with Desmos. Graph NOTE: be aware though that this method still calls both functions separately in the background. Use custom colors to go beyond the default Desmos palette and add a personal touch to your graphs! You can define colors using hue, saturation, and value parameters (HSV); or by specifying the amounts of red, green, and blue in the color (RGB). Piecewise functions are functions that have multiple pieces, or sections. A piecewise function is a function made up of different parts. How to obtain a piecewise periodic function? Hey! Im trying to write a piecewise periodic function for a project My function looks something like this: { cos (x)<0 : 0, (theta) (2π - theta) : cos (x) }. Using your TI-84 Plus calculator to graph piecewise functions can be a bit tricky, but you’ll get the hang of it soon enough. Piecewise functions with Desmos. ago not really, graphing root x only shows the principal value. Piecewise functions are functions that have multiple pieces, or sections. This video explains how to graph a piecewie defined using desmos. NOTE: be aware though that this method still calls both functions separately in the background. Step 1: Initial Setup — Source Picture Step 2: Divide and Conquer Step 3: Portion Crunching Step 3a: Drawing Curves Modeling Line Segments Modeling Circular/Elliptical Segments Modeling Other Curvy Segments Subdividing Curve Segments Curve Trimming Step 3b: Coloring Regions Portion Crunching in Action: Antenna & Hat Step 4: More Portion Crunching. From piecewise functions and implicit relations, to including sliders within your restrictions, Desmos makes it easy to control what you see in the coordinate plane. com-In order to successfully make art students will need to know piecewise functions and how to write equations of various functions (linear, cubic, quadratic, square root, absolute value) Subjects: Algebra, Algebra 2, Math Grades:. Frederick April 28, 2023, 7:00pm 1. Piecewise functions can be split into as many pieces as necessary. ) Curve Trimming Once we finish modeling all the curve segments in a close figure, we can begin to. The absolute value function is a very good example of a piecewise function. You can either add a table and enter the data in the graphing calculator, or you can copy data from a spreadsheet and paste it into a blank expression line. (For more on defining piecewise functions in Desmos, see Desmos: A Definitive Guide on Graphing and Computing. Introduction to piecewise functions. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more. The piece on the interval -4/leq x /leq -1 −4 ≤ x ≤ −1 represents the function f (x. Domain coloring of W (-1,z) (The white snowdots are not part of the actual) Hello everyone. Pieces may be single points, lines, or curves. To start, you’ll need some data in a table. Explore math with our beautiful, free online graphing calculator. The format for graphing Piecewise Functions uses an if statement, you have the condition, then the result, then otherwise. This is where you will enter the equation of your piecewise function. How to obtain a piecewise periodic function? Hey! Im trying to write a piecewise periodic function for a project My function looks something like this: { cos (x)<0 : 0, (theta) (2π - theta) : cos (x) } However this only works in the interval 0 to π. This activity can be used to introduce piecewise functions. Desmos offers best-in-class calculators, digital math activities, and curriculum to help every student love math and love learning math. Learn how to sketch graphs of piecewise functions using Desmos graphing calculator through solved examples mentioned in my article. Or perhaps your local video store: rent a game, $5/per. Desmos Calculator - Piecewise Functions. Referencing a piecewise function in another function in Desmos …. When creating a table in Desmos, points can be connected by clicking and long-holding the icon next to the dependent column header. Piecewise function 1 2 offerto da per salvare i grafici! Nuovo grafico vuoto Esempi Rette: forma esplicita esempio Rette: equazione per un punto esempio Rette: equazione per due punti esempio Parabole: equazione standard esempio Parabole: equazione al vertice esempio Parabole: equazione standard + tangente esempio Trigonometria: periodo e. Each function “piece” is defined over a certain interval. A piecewise function is a function that is defined in separate pieces or intervals. In this activity, students use piecewise functions to match graphs of rays and segments, interpret function values in a graphical context, and apply what they learn to a postage rates problem. Piecewise Functions on Desmos - YouTube 0:00 / 4:36 Piecewise Functions on Desmos MrDaveblev 1. Piecewise Linear Functions • Activity Builder by Desmos. Piece wise functions in Desmos are defined by typing in f ( x) = { C 1: D 1, C 2: D 2, … } where C i is a condition like x < 1 2 and D i is a definition for the range of values described by C i, like / x − 1 2 /. The function is the constant function V ( t) = 0, when t < 0, but a different constant function, V ( t) = 5, when t ≥ 0. How to obtain a piecewise periodic function? Hey! Im trying to write a piecewise periodic function for a project My function looks something like this: { cos (x)<0 : 0, (theta) (2π - theta) : cos (x) } However this only works in the interval 0 to π. Do action I while f l e n g t h <= 20. They begin with an informal exploration of domain and range using a graph, and build up to representing the domain and range of piecewise functions using inequalities. powered by x x y y a squared a 2 a Superscript Transformations: Inverse of a Function. As with other functions, a piecewise function can also be given a name by simply replacing the leftmost variable with the name of the function. Learn Desmos: Restrictions. Loading Graph a piecewise function and its derivative Transformations: Inverse of a Function. As with other functions, a piecewise function can also be given a name by simply replacing the leftmost variable with the name of the function. The format for graphing Piecewise Functions uses an. In this activity, students practice finding the domain and range of piecewise functions. This activity can be used to introduce piecewise functions. Desmos: A Definitive Guide on Graphing and Computing. it simply plots both of them together. 75K subscribers Subscribe 32K views 4 years ago Using Desmos to Graph and Evaluate Piecewise. Now, I have double-checked and patched for that interval with a piecewise. It may or may not be a continuous function. Piecewise function. This particular function has two pieces. Conic Sections: Parabola and Focus. Where ever input thresholds (or boundaries) require significant changes in output modeling, you will find piece-wise functions. Hi everyone, I’m currently trying to graph a piecewise function in Desmos, but I’m not quite sure how to do it. Use custom colors to go beyond the default Desmos palette and add a personal touch to your graphs! You can define colors using hue, saturation, and value parameters (HSV); or by specifying the amounts of red, green, and blue in the color (RGB). But clicking it manually is wasting time, so limit it until x = 20 is enough with conditional syntax or piecewise function format with curly bracket. This worksheet will help with Piecewise functions. The piecewise function below has three pieces. Desmos Calculator - Piecewise Functions. Functions – Desmos Help Center. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. This activity can be used to introduce piecewise functions. Piecewise function 1 2 offerto da per salvare i grafici! Nuovo grafico vuoto Esempi Rette: forma esplicita esempio Rette: equazione per un punto esempio Rette: equazione per due punti esempio Parabole: equazione standard esempio Parabole: equazione al vertice esempio Parabole: equazione standard + tangente esempio Trigonometria: periodo e ampiezza. In this activity, students practice finding the domain and range of piecewise functions. If what you want is just a function that in one single expression plots two functions then you just need a list of functions. Conic Sections: Parabola and Focus. Graph a Piecewise Defined Function Using Desmos (3 parts) Mathispower4u. Or, if a a is not positive, set b b to 1, otherwise, set c c to 1. This Math Monday, fall in love with Desmos as we explore the activity Piecewise Functions: Introducing Marginal and Effective Income Tax Rates. Piecewise Linear Functions • Activity Builder by Desmos. Piecewise Function On DesmosGraphing Piecewise Functions using Desmos Show more. More specifically, it’s a function defined over two or more intervals rather than with one simple equation over the domain. This way, we can recycle the function repeatedly without having to. Piecewise expressions (using restriction notation in curly braces) allow selecting between different actions depending on a condition. Because each of the pieces in this definition is constant, the function V is called a piecewise constant function. Regressions – Desmos Help Center. Piecewise Linear Functions • Activity Builder by Desmos>Piecewise Linear Functions • Activity Builder by Desmos. The function I’m working with is f (x) = { 2x + 1 if x ≤ 0, 4x - 3 if x > 0 }. piecewise function in Desmos?>How can I graph a piecewise function in Desmos?. In this activity, students practice finding the domain and range of piecewise functions. How to graph a piecewise function on desmos Dr. Learn how to sketch graphs of piecewise functions using Desmos graphing calculator through solved examples mentioned in my article. Graph functions, plot points, visualize algebraic equations, add sliders, animate graphs, and more. 75K subscribers Subscribe 32K views 4 years ago Using Desmos to Graph and Evaluate Piecewise. Conic Sections: Parabola and Focus. Piecewise Functions Project Created by Cooper Classroom -Students will create an art piece digitally using desmos. powered by x x y y a squared a 2 a Transformations: Inverse of a Function. Graphing a Piecewise function using Desmos : r/cheatatmathhomework. They begin with an informal exploration of domain and range using a graph, and build up to representing the domain and range of piecewise functions using inequalities. Introduction. Loading Graph a piecewise function and its derivative Transformations: Inverse of a Function. per salvare i grafici! Nuovo grafico vuoto. Piecewise functions with Desmos David Dobervich 4. Piecewise Functions on Desmos - YouTube 0:00 / 4:36 Piecewise Functions on Desmos MrDaveblev 1. Practice for Graphing Piecewise Functions. A piecewise function is actually made up of “pieces” of different functions. Or, if a a is not positive, set b. Desmos Art Functions Teaching Resources. Graphing a Piecewise function using Desmos I needed to create a piecewise function, and then graph it based on two cell phone plans. This way, we can recycle the function repeatedly without having to redefine it ever again. Share Cite Follow edited Oct 21, 2022 at 11:37 answered Oct 21, 2022 at 11:32 Muhammad Ikhwan Perwira. Graph a piecewise function and its derivative. Getting Started: Inequalities and Restrictions – Desmos Help >Getting Started: Inequalities and Restrictions – Desmos Help. – user21820 Dec 27, 2015 at 10:50 very nice+1 – Bhaskara-III Dec 27, 2015 at 16:20 Add a comment 11. Piecewise Functions on Desmos - YouTube 0:00 / 4:36 Piecewise Functions on Desmos MrDaveblev 1. PIECEWISE FUNCTIONS PICTURE PROJECT. How to graph a piecewise function on desmos Dr. 50 for a midsize sedan, $10 for an SUV, $20 for a Hummer. Explore math with our beautiful, free online graphing calculator. How can I graph a piecewise function in Desmos?. Domain and Range Introduction • Activity Builder by Desmos. How to obtain a piecewise periodic function? : r/desmos. In order to change the graph, you NEED to input it in this format: if [x < #, first equation, second equation] You can change the #, first equation, and second equation for g (x). 44K subscribers Subscribe 17K views 8 years ago An example of how to create piece-wise defined functions with Desmos for your. Piecewise function 1 2 offerto da per salvare i grafici! Nuovo grafico vuoto Esempi Rette: forma esplicita esempio Rette: equazione per un punto esempio Rette: equazione per due punti esempio Parabole: equazione standard esempio Parabole: equazione al vertice esempio Parabole: equazione standard + tangente esempio Trigonometria: periodo e ampiezza. I was trying to reference a piecewise function inside another function in desmos. Using the Polygon Function to Connect Points. Piecewise functions with Desmos David Dobervich 4. Here is a step-by-step guide on how to graph a piecewise function on Desmos: Go to the Desmos website and click on the Graphing Calculator button. In this activity, students use piecewise functions to match graphs of rays and segments, interpret function values in a graphical context, and apply what they learn to a postage rates problem. A piecewise function is a function built from pieces of different functions over different intervals. Intro to Desmos and piecewise functions. Piecewise function. Intro to Desmos and piecewise functions. Desmos>Graphing Calculator. Intro to Desmos and piecewise functions Transformations: Inverse of a Function. Piecewise Function: Definition, How to Draw. The format for graphing Piecewise Functions uses an if statement, you have the condition, then the result, then otherwise. On the left side of the screen, you will see a text box labeled y=. How to create your name on Desmos. Graph a Piecewise Defined Function Using Desmos (3 parts). Piecewise Linear Functions • Activity Builder by Desmos. In this activity, students use piecewise functions to match graphs of rays and segments, interpret function values in a graphical context, and apply what they learn to a postage rates problem. Loading Graphing Piecewise Functions. Piecewise expressions (using restriction notation in curly braces) allow selecting between different actions depending on a condition. Graph of piecewise function. Referencing your image, f ( x) should be defined as f ( x) = { x < 1 2: / x − 1 2 /, 1 2 ≤ x ≤ 1: 0, 1 < x: / 1 − x / } Share Cite Follow. For each region or interval, the function may have a different equation or rule that describes it. You can also change the #s and the three equations for f (x). You can even create a list of colors to use with a list of objects!. Piecewise Linear Functions • Teacher Guide Loading. How to create your name on Desmos using parent functions. From piecewise functions and implicit relations, to including sliders within your restrictions, Desmos makes it easy to control what you see in the coordinate plane. Actions – Desmos Help Center>Actions – Desmos Help Center. Get started with the video on the right, then dive deeper with. Choose from two different styles. This video explains how to graph a piecewie defined using desmos. In this example, let’s call our two sets of data x1 x 1 and y1 y 1. Here is a step-by-step guide on how to graph a piecewise function on Desmos: Go to the Desmos website and click on the Graphing Calculator button. Graph a Piecewise Defined Function Using Desmos (3 parts)>Graph a Piecewise Defined Function Using Desmos (3 parts). The function I’m working with is f (x) = { 2x + 1 if x ≤ 0, 4x - 3 if x > 0 }. But clicking it manually is wasting time, so limit it until x = 20 is enough with conditional syntax or piecewise function format with curly bracket. Now, if what you need is a way to mathematically model two functions of a line. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright. Interactive online graphing calculator - graph functions, conics, and inequalities free of charge. com>How do you graph piecewise functions on Desmos?. If someone could make one and send me the link it would be much appreciated! Due Tomorrow. 44K subscribers Subscribe 17K views 8 years ago An example of how to create piece-wise defined functions with Desmos for your future. We dont need itteration delay, so we set it to the 0ms. If you want the actual function, you have to swap x and f (x) and solve for f (x) 3 IKnowATonOfStuffAMA • 3 yr. In your day to day life, a piece wise function might be found at the local car wash: $5 for a compact, $7. In this activity, students use piecewise functions to match graphs of rays and segments, interpret function values in a graphical context, and apply what they learn to a postage rates problem. piecewise functions on Desmos?. (For more on defining piecewise functions in Desmos, see Desmos: A Definitive Guide on Graphing and Computing. (For more on defining piecewise functions in Desmos, see Desmos: A Definitive Guide on Graphing and Computing. From piecewise functions and implicit relations, to including sliders within your restrictions, Desmos makes it easy to control what you see in the coordinate plane. They are defined piece by piece, with various functions defining each interval. 68K views 8 years ago Desmos Tutorials. The completed Lambert W function. EXPLORE Try to click and drag the graphs and see how the function change. Conic Sections: Ellipse with Foci. Exploring Absolute Value Functions • Activity Builder by Desmos. The format for graphing Piecewise Functions uses an. Watch this quick tutorial to learn how: Who knew piecewise notation could be so fun! Click the graphs below to see domain and range restrictions in action:. A piecewise function is a function built from pieces of different functions over different intervals. Desmos Art: Definitive Guide to Computational Sketching. Piecewise Linear Functions • Teacher Guide Loading. Graphing a Piecewise function using Desmos : r. Limiting the domain and range on the Desmos graphing calculator is simple. Piecewise function. You can do things like decrement a a, but only if it is positive. Autofill tables by defining column headers with functions, or build a movable point to trace a path along a particular curve. Once we finish modeling all the curve segments in a close figure, we can begin to trim off the excessive parts of each modeling curve by imposing restrictions on the associated equation. Getting Started: Inequalities and Restrictions. This is where you will enter the equation of your piecewise function. A piecewise function is a function f (x) which has different definitions in different intervals of x. Piecewise expressions (using restriction notation in curly braces) allow selecting between different actions depending on a condition. Here is an activity to allow students to practice writing functions from given graphs with restricted domains. I have created the function but need help graphing them on desmos. powered by x x y y a squared a 2 a Transformations: Inverse of a Function. Statistics: Anscombes Quartet. I was trying to reference a piecewise function inside another function in desmos.