# Trigonometric Identities and Equations

### Popular Tutorials in Trigonometric Identities and Equations

• #### What Does the Graph of the Cosine Function Look Like?

You can use the unit circle to help you graph the cosine function! In this tutorial, you'll learn how to do exactly that!

• #### What Does the Graph of the Tangent Function Look Like?

If you want to make the graph of the tangent function, you can use the unit circle to help you plot points. This tutorial shows you how to use the unit circle to make the tangent function graph!

• #### What is a Periodic Function?

Periodic functions have some special qualities! In this tutorial, you'll be introduced to these functions and learn what a graph must have to be called a periodic function.

• #### How Do You Horizontally Translate a Trigonometric Graph?

Translating a graph of sine or cosine horizontally can be fun, but you need to understand how it works. Follow along with this tutorial to learn how to horizontally shift the sine and cosine graphs!