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# Sum to Product Formulas for Sine and Cosine

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

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## Sum-to-Product Formulas - Overview

by CK-12 //basic
Overview
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## Sum-to-Product Formulas - Example 1

by CK-12 //basic
Use the sum-to-product formula to write the sum or difference as a product
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## Sum-to-Product Formulas - Example 2

by CK-12 //basic
Find the exact value of trigonometric functions using a sum-to-product formula
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## Sum-to-Product Formulas - Example 3

by CK-12 //basic
Solve a trigonometric equation using a sum-to-product formula
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