1. Academy Algebra II Pre-Calculus (5.1, 5.2)
14.3: Trigonometric Identities
HW: today: none,
HW tomorrow: p.928 (16-34 even)

2. Trig Identities
Reciprocal Identities
Quotient Identities

3. Trig Identities
Pythagorean Identities
Even/Odd Identities

4. Trig Identities
Cofunction Identities

5. Simplify the Trig Expression

6. Simplify the Trig Expression
Check using your calculator:
Y1= Question
Y2= Answer
Check: graphs/tables are
the same

7. Verify.

8. Verify the Identity Algebraically.

9. Verify the Identity Algebraically.

10. Factor the expression and simplify.

11. 5.2: Verifying Trig Identities
1.) Work with one side of the equation. 2.) Algebra: Look for opportunities to factor an expression, add fractions, square a binomial, or create a monomial denominator. 3.) Trig: 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.

12. Verify.

13. Multiply and simplify.

14. Verify.

15. Verify the Identity.

16. Verify the Identity.

17. Verify the Identity.

18. Verify the Identity.

19. Verify the Identity.

20. Verify the Identity.