1. Fundamental Identities
5.1
Fundamental Identities

2. What you’ll learn about
Identities
Basic Trigonometric Identities
Pythagorean Identities
Cofunction Identities
Odd-Even Identities
Simplifying Trigonometric Expressions
Solving Trigonometric Equations
… and why
Identities are important when working with trigonometric
functions in calculus.

3. Basic Trigonometric Identities

4. Pythagorean Identities

5. Example Using Identities

6. Example Using Identities

7. Cofunction Identities

8. Cofunction Identities

9. Even-Odd Identities

10. Example Simplifying by Factoring and Using Identities

11. Example Simplifying by Factoring and Using Identities

12. Example Simplifying by Expanding and Using Identities

13. Example Simplifying by Expanding and Using Identities

14. Example Solving a Trigonometric Equation

15. Example Solving a Trigonometric Equation