1. 5.1 Using Fundamental Identities
Evaluating trig functions
Simplifying trig expressions
Solve trig equations

2. Reciprocal Identities

3. Quotient Identities

4. Pythagorean identities

5. Cofunction Identities

6. Even/Odd identities

7. Evaluating
Use a given value with an identity to find another trig value
You can also draw a right triangle

8. Simplifying Look for a common factor to factor out
Try to write the expression in terms of only 1 trig function
Try to rewrite the expression using only sin and cos
Substitute values from trig identities

9. Factoring Rewrite the expression in terms of 1 trig function
Substitute variables for the trig functions to write the expression in polynomial form
Factor the polynomial and then substitute back in the trig function