1. Algebra II Honors
9.7: Using Trigonometric Identities (PC 5.1, 5.2) HW: p.517 (12-20 even, even)

2. Trig Identities
Pythagorean Identities
Even/Odd Identities

3. Trig Identities
Cofunction Identities

4. Simplify the Trig Expression

5. Simplify the Trig Expression
PC: P.381 (#22)
Check using your calculator:
Y1= Question
Y2= Answer
Check: graphs/tables are
the same

6. Simplify the Trig Expression
PC: P.381 (#30)

7. Verify the Identity Algebraically.
PC: P.381 (#46)

8. Verify.
PC: P.381 (#66)

9. Verifying Trig Identities
1.) Work with one side. 2.) Look for opportunities to factor an expression, add fractions, square a binomial, or create a monomial denominator. 3.) Look for opportunities to use the fundamental identities. 4.) If the preceding guidelines do not help, try converting to all sines and cosines. 5.) Try something! Even making an attempt that leads to a dead end gives insight.

10. Verify the Identity Algebraically.
PC: P.381 (#56)

11. Multiply and simplify.
PC: P.381 (#72)

12. Verify.
PC: P.381 (#76)

13. Verify the Identity.

14. Verify the Identity.

15. Verify the Identity.

16. Verify the Identity.