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)