GoLang acos

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PHP acos

PHP original manual for acos [ show | php.net ]


(PHP 4, PHP 5, PHP 7)

acosArc cosine


float acos ( float $arg )

Returns the arc cosine of arg in radians. acos() is the inverse function of cos(), which means that a==cos(acos(a)) for every value of a that is within acos()' range.



The argument to process

Return Values

The arc cosine of arg in radians.

See Also