acos
PHP 4, PHP 5, PHP 7, PHP 8
acos - Arc cosine
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.