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),