atan
PHP 4, PHP 5, PHP 7, PHP 8
atan - Arc tangent
atan(
float$num ): float
Returns the arc tangent of num in radians. atan is the inverse function of tan, which means that a==tan(atan(a)) for every value of a that is within atan's range.
Parameters
- num
-
The argument to process
Return Values
The arc tangent of num in radians.