February 23, 2024
Learn how to put lim in Desmos with this comprehensive step-by-step guide. Understand the importance of limits and common mistakes to avoid. Get interactive examples and troubleshoot tips for mastering limits.


Have you ever found yourself struggling with calculating limits in Desmos? Do you want to get a better understanding of the fundamental concept of limits and their importance in analysis of functions? This article is here to help you! This step-by-step guide will teach you how to use the lim command in Desmos, avoid common mistakes, troubleshoot problems, and explore interactive examples. So, let’s dive into the world of limits!

A Step-by-step Guide to Using Lim in Desmos

Creating a Graph in Desmos

The first step to using lim is to create a graph in Desmos. Open the website and create a new graph by clicking on the plus button. You can also use the existing examples to follow the article more easily. Name your graph and add a title if you wish.

Adding a Function

The next step is to add a function to your graph. Click on the plus sign on the left side of the screen and choose “function.” Enter the function in the provided input box. Now, you can see the corresponding graph of the function. You can also set the range and domain of the function by clicking on the wrench button.

Example Functions for Calculating Limits

Here are some example functions for calculating limits in Desmos:

  • x^2
  • (x^2-1)/(x-1)
  • sin(x)/x
  • 1/x

Utilizing the Lim Command

Now, it’s time to utilize the lim command for calculating limits. The lim command in Desmos is in the form of:

lim_(x->a) f(x)

where x is the variable, a is the value of x that f(x) approaches, and f(x) is the function.

Step-by-step Guide to Using Lim in Desmos

Follow these simple steps to use lim in Desmos:

  1. Enter the lim command in the input box of the function. For example:
  2. lim_(x->0) sin(x)/x

  3. You can also drag a slider to set the value of a. For example:
  4. f(x)=x^2

    lim_(x->a) f(x)

  5. Now, you can see the corresponding graph and value of the limit on the screen.

Screenshots to Accompany Each Step

Here are some screenshots to assist you in each step:

Step-by-Step Guide

The Importance of Limits

Explanation of the Fundamental Concept of Limits

Limits are the most fundamental concept of calculus and are used to analyze functions. In simple terms, a limit is defined as the value a function tends to as the input value approaches a certain target value. It can be thought of as the behavior of a function near a point.

Definition of Limit

The formal definition of a limit is:

lim_(x->a) f(x)=L

where L is a real number and f(x) can be arbitrarily close to L when x is sufficiently close to a (on either side of a).

Importance of Understanding Limits in Analyzing Functions

Understanding limits is crucial in analyzing the behavior of a function. It helps to determine if a function is continuous or discontinuous at a certain point, if there are asymptotes, and if there are any discontinuities.

Examples of How Limits are Useful in Real-world Applications

Limits are widely used in various fields, including physics, engineering, and mathematics, to name a few.


The study of motion, thermodynamics, and quantum mechanics relies heavily on limits and derivatives. For example, limits are used to calculate velocity and acceleration of an object.


Limits are used in designing and analyzing systems, such as electronic circuits, mechanical systems, and structural designs.


Limits are a fundamental part of calculus and are used in a range of topics, including integration, differentiation, optimization, and series.

Common Mistakes when using Lim in Desmos

List of Common Errors when using Lim

Here are some common errors that students make when using lim in Desmos:

  1. Syntax errors
  2. Undefined functions
  3. Incorrect use of parentheses

Tips for Avoiding Common Errors

Here are some tips for avoiding common errors:

  1. Check the syntax of the lim command before entering it.
  2. Make sure the function you are using is defined within the limits.
  3. Use proper syntax for parentheses and brackets.

Interactive Examples

Example Problems

Here are some example problems:

  1. Calculate the limit of x^2 as x approaches 4.
  2. Calculate the limit of f(x)= { 1 if x≥0, -1 if x<0 } as x approaches 0.

Accompanying Screenshots

Here are some screenshots to accompany the example problems:

Example Problems

Interactive Components for Readers to Attempt

Readers are encouraged to attempt the example problems on Desmos and share their results in the comments below!

Advanced Features

Explanation of Approaches from the Left and Right

The approaches from the left and right are used to calculate one-sided limits. The left-hand limit measures the behavior of a function as the input x approaches a given value from the left side, that is, values that are less than the given value of a. The right-hand limit measures the behavior of a function as the input approaches a given value from the right side, that is, values that are greater than the given value of a.

Example Problem Using Approaches from Left and Right

Let’s consider the function f(x)= { x+1 if x<1, x^2-1 if x≥1 }. Calculate the limit of f(x) as x approaches 1 from the left and right.

Limits from the left:

lim_(x->1-) f(x)= lim_(x->1-) (x+1)=2

Limits from the right:

lim_(x->1+) f(x)= lim_(x->1+) (x^2-1)=0

So, the limit does not exist.

Accompanying Screenshots

Here are some screenshots to accompany the example:

Advanced Features

Troubleshooting Tips

Common Problems Encountered when Calculating Limits in Desmos

Here are some common problems encountered when calculating limits in Desmos:

  1. Syntax errors
  2. Undefined function errors
  3. Inaccurate results

Troubleshooting Techniques for Common Problems

Here are some techniques for troubleshooting common problems:

  1. Check the syntax of the command and make sure there are no typos.
  2. Check if the function is defined within the limits.
  3. Use sliders to adjust the limits and obtain better results.

Additional Resources for Seeking Help

If you encounter any problems or have any questions, do not hesitate to seek help from online resources. The Desmos website offers comprehensive help and support pages for users to access.


Summary of Key Points

Now, you have learned how to use the lim command in Desmos to calculate limits, understand the fundamental concept of limits, know the importance of limits in various fields, and avoid common mistakes. You also have access to interactive examples and troubleshooting tips to help you master limits in Desmos.

Final Thoughts and Recommendations

Take your time to practice using the lim command and experimenting with different examples. The more you practice, the better you will get at analyzing functions and interpreting the behavior of the limits. Remember to seek help if you encounter any difficulties.

Thank you for reading this step-by-step guide to using lim in Desmos.

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