6.5b: Product to Sum and Sum to Product Formulas

Objectives:

• Use product to sum and sum to product formulas to, evaluate trig functions, verify trig identities, and solve trig equations.

Example 1

Example 2
*MISTAKE
Thank you Harrison for pointing out that (195-105)/2=45 and not 90. This changes the final answer. Come up with the answer and we will discuss it in class.

Example 3

Problem set 6.5b:

# 3, 5, 64, 68, 78, 79, 80, 84, 86, 88, 90