1. Objective: Recognize and use fundamental identities.
Warm up
1. Evaluate a. b. c.
Is the function even or odd.
a b.

2. Is the function even, odd or neither. Prove it algebraically.
Use symmetry to classify as even or odd functions.
a b.

3. Even-odd Identities.
even
odd
Example 1
Fill in the blanks.
a. If , then _________.
If , then ____________.
If , then _____________.

4. c. If. What is =___________. d. If. What is _________. Example 2 a
c. If . What is =___________. d. If . What is _________. Example 2 a. Find . b. Write in terms of sine and cosine.

5. Reciprocal Identities Example 3 Given that and
Reciprocal Identities Example 3 Given that and . Find the four remaining trig functions.