1. Verifying Trigonometric Identities
7-2
Verifying Trigonometric Identities

2. Objectives
Use the basic trigonometric identities to verify other identities.
Find numerical values of trigonometric functions.

3. Warm-up
1) Prove that sin(x)+cos(x)=1 is NOT a trigonometric identity by producing a counterexample.
2) If csc(Ө) = 8/5, find sin(Ө)
3) If cot(Ө) =12/5, find sin (Ө) 4)

4. Check Up 1)
2) 5/8
3) + or – 5/13
4) 1

5. Suggestion for Verifying Trig. Identities

6. Example 1

7. You Try!!!

8. You Check!!!

9. Example 2

10. Example 2 Continued

11. Example 2 Continued
We’ve verified the identity working on the right side. Is it possible to verify the identity working on the left side? Try!
Sometimes it is easier to work on one side over the other. You will be able to decide which side is more beneficial to work with once you get lots of practice.

12. Here’s How!

13. Example 3

14. You Try!!!

15. You Check!!!

16. Example 4

17. You Try!!!

18. You Check!!!

19. Calculator Exploration

20. Check It!!!

21. Assignments
Classwork – pg. 434 #5-11
Homework – pg. 434 #13-39