# 3.10: Double Angle Identities

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**Practice**Double Angle Identities

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Term | Definition |
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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. |

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Description

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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