1. Multiple Angle Identities
5.4
Multiple Angle Identities

2. What you’ll learn about
Double-Angle Identities
Power-Reducing Identities
Half-Angle Identities
Solving Trigonometric Equations
… and why
These identities are useful in calculus courses.

3. Double Angle Identities

4. Proving a Double-Angle Identity

5. Power-Reducing Identities

6. Example Reducing a Power of 4

7. Example Reducing a Power of 4

8. Half-Angle Identities

9. Example Using a Double Angle Identity

10. Example Using a Double Angle Identity

11. Example Using a Double Angle Identity

12. Example Using a Double Angle Identity