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# Product to Sum Formulas for Sine and Cosine

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

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## Product to Sum Formulas for Sine and Cosine

Examples of how to transform a product of trigonometric functions into a sum of trigonometric functions

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## Sum to Product and Product to Sum Identities

Uses trigonometric identities to rewrite trigonometric expressions and evaluate functions.

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## Product-to-Sum Formulas - Overview

by CK-12 //basic

Overview

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## Product-to-Sum Formulas - Example 1

by CK-12 //basic

Rewrite the product of two trigonometric expressions as a sum or difference

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