asin

Arc sine

Description

float asin(float $num)

Returns the arc sine of num in radians. asin is the inverse function of sin, which means that $num == sin(asin($num)) for every value of num that is in the domain of asin.

Parameters

num

The argument to process

Return Values

The arc sine of num in radians

See Also

  • sin
  • asinh
  • acos
  • atan