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# 3.10: Double Angle Identities

Difficulty Level: At Grade Created by: CK-12
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Practice Double Angle Identities

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Estimated10 minsto complete
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Estimated10 minsto complete
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### Vocabulary Language: English

Double Angle Identity

A double angle identity relates the trigonometric function of two times an argument to a set of trigonometric functions, each containing the original argument.

Half Angle Identity

A half angle identity relates a trigonometric function of one half of an argument to a set of trigonometric functions, each containing the original argument.

identity

An identity is a mathematical sentence involving the symbol “=” that is always true for variables within the domains of the expressions on either side.

power reducing identity

A power reducing identity relates the power of a trigonometric function containing a given argument to a set of trigonometric functions, each containing the original argument.

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