Arccos

Arccosine, the inverse of Cos restricted to .

WikipediaInverse trigonometric functionsMathWorldInverseCosineInverseTrigonometricFunctionsWikidataQ674533nLabinverse trigonometric functionBritannicatopic/arc-sineDLMF4.23.ii.p1FungrimAcosFungrim entry33e034718f3ab8fdcdec7f2dfda800Wolfram LanguageArcCos✓

Arccos(x)the principal value with .

Domain: Elementary functions

Details

Real-valued only for ; outside that range the result is complex.
Co-function with Arcsin: .
Undoes Cos on its principal branch: for .

Examples

See also: Cos, Arcsin, Arctan