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Half-angle Formulas

Alternate names

half-angle identities | trigonometric half-angle identities

Basic definition

A set of formulas that express trigonometric functions of half an angle in terms of the trigonometric functions of the original angle.

Detailed definition

Half-angle formulas and formulas expressing trigonometric functions of an angle x/2 in terms of functions of an angle x. For real x,

Related terms

double-angle formulas | hyperbolic functions | multiple-angle formulas | prosthaphaeresis formulas | trigonometric addition formulas | trigonometric functions | trigonometry | Weierstrass substitution

Educational grade level

high school level (California trigonometry standard)

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