Using Fundamental Identities

We studied before the basic definitions and some properties of the individual trigonometric functions. In this lesson, we will use the fundamental identities to do the following:

• Evaluate trigonometric functions
• Simplify trigonometric expressions
• Develop additional trigonometric identities

Read more about using  fundamental trigonometric identities below.

Using Fundamental Identities

Practice: Recognize and write the fundamental trigonometric identities in the following exercises.

Using Fundamental Identities 1

Using Fundamental Identities 2

Using Fundamental Identities 3