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# Double Angle Identities

## Simplifying trigonometric functions with twice a given angle.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
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## Multiple Angle Formulas - Overview

by CK-12 //basic
Overview
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## Power-Reducing formulas - Overview

by CK-12 //basic
Overview
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## Multiple Angle Formulas - Example 2

by CK-12 //basic
Solve a multiple angle equation
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## Multiple Angle Formulas - Example 3

by CK-12 //basic
Use a double angle formula to rewrite an equation
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## Multiple Angle Formulas - Example 4

by CK-12 //basic
Evaluate functions involving double angles
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## Power-Reducing formulas - Example 1

by CK-12 //basic
Rewrite the trigonometric expression as a sum of first powers of cosine
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