acos

(PHP 4, PHP 5, PHP 7, PHP 8)

acos — Arc cosine

Description

acos(float $num): float

Returns the arc cosine of num 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.

Parameters

num: The argument to process

Return Values

The arc cosine of num in radians.

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