<meta http-equiv="refresh" content="1; url=/nojavascript/">

# Sum to Product Formulas for Sine and Cosine

## Relation of the sum or difference of two trigonometric functions to a product.

0%
Progress
Practice Sum to Product Formulas for Sine and Cosine
Progress
0%
Sum-to-Product Formulas - Example 1
Use the sum-to-product formula to write the sum or difference as a product