1. Objective: Use power-reducing and half angle identities.
Warm up
Double angle identity for cosine:
Write in terms of cosine only.
b. Write in terms of sine only.

2. Example 1
Derive a power reducing identity for cosine.
b. Derive a power reducing identity for sine.
c. Derive a power reducing identity for tangent.

3. Example 2 Rewrite the expression in terms with no power greater than 1
Example 2 Rewrite the expression in terms with no power greater than 1. a.

4. b.

6. Proof: Unit Circle

7. Example 3 Use half angle identities to find the exact value. a. b. c.

8. Assignment Pg 614 #