# 3.10: Double Angle Identities

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**Practice**Double Angle Identities

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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.### Image Attributions

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Derivation of double angle identities for sine, cosine, and tangent

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Date Created:

Sep 26, 2012
Last Modified:

Aug 11, 2016
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