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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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