ProducttoSum Trigonometric Identities

1
Product-to-Sum Trigonometric Identities

• Section 5.4

2
Objectives

• Apply a product-to-sum identity to evaluate the
  sine or cosine of an angle.
• Apply a product-to-sum identity to simplify an
  expression

3
Sum/Difference-to-Product Identities
4
Product-to-Sum Identities
5
Use the product-to-sum formula to find the exact
value of
6
Use the sum-to-product formula to find the exact
value of
7
Express the given product as a sum or difference
containing only sines or cosines