1. 5.5 Multiple-Angle Formulas
Students will use multiple-angle formulas to rewrite and evaluate trigonometric functions.
Students will use power-reducing formulas to rewrite and evaluate trigonometric functions.
Students will use half-angle formulas to rewrite and evaluate trigonometric functions.
Students will use product-to-sum and sum-to-product formulas to rewrite and evaluate trigonometric functions.

2. Section 5.5, Double-Angle Formulas, pg. 375

3. Why is ?
Remember:

4. Example 1
Solve.

5. Try #10 on p. 382

6. Why is ?
Remember:

7. Example 3
Use the following to find and :

8. Try #18 on p. 382

9. Section 5.5, Half-Angle Formulas, pg. 378

10. Use the figure (p.382 #33-40) to find the exact value of the trigonometric function.

11. Try #34 on p. 382

12. Example 6
Find the exact value of

13. Try #42 on p. 383

14. Find the following values given in quad. II

15. Try #50 on p. 383

16. Use the half-angle formulas to simplify the expression.

17. Try #56 on p. 383

18. Example 7
Find all solutions if in the interval

19. Section 5.5, Product-to-Sum Formulas, pg. 379

20. Example 8 Rewrite the product as a sum or difference

21. Section 5.5, Sum-to-Product Formulas, pg. 380

22. Example 9
Find the exact value of

23. Example 10
Find all solutions of in the interval