redhat man page for asin

ASIN(3) 						     Linux Programmer's Manual							   ASIN(3)

NAME
       asin - arc sine function

SYNOPSIS
       #include <math.h>

       double asin(double x);

DESCRIPTION
       The  asin()  function  calculates the arc sine of x; that is the value whose sine is x.	If x falls outside the range -1 to 1, asin() fails
       and errno is set.

RETURN VALUE
       The asin() function returns the arc sine in radians and the value is mathematically defined to be between -PI/2 and PI/2 (inclusive).

ERRORS
       EDOM   x is out of range.

CONFORMING TO
       SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO
       acos(3), atan(3), atan2(3), cos(3), sin(3), tan(3)

								    1993-06-08								   ASIN(3)