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



NAME
       asin, asinf, asinl - arc sine function

SYNOPSIS
       #include <math.h>

       double asin(double x);
       float asinf(float x);
       long double asinl(long double x);

       Link with -lm.

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(1,8) 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.  The float and long  double  variants
       are C99 requirements.

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



                                  2002-07-25                           ASIN(3)