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

NAME
     asin, asinf, asinl - arc sine functions

SYNOPSIS
     #include <math.h>

     double
     asin(double x);

     float
     asinf(float x);

     long double
     asinl(long double x);

DESCRIPTION
     The asin() function computes the principal value of the arc sine of x in
     the range [-pi/2, +pi/2].  The asinf() function is a single precision
     version of asin().  The asinl() function is an extended precision version
     of asin().

RETURN VALUES
     If |x|>1, asin(x), asinf(x) and asinl(x) return NaN and set the global
     variable errno to EDOM.

SEE ALSO
     acos(3), atan(3), atan2(3), cos(3), cosh(3), math(3), sin(3), sinh(3),
     tan(3), tanh(3)

OpenBSD 4.9                    December 12, 2008                   OpenBSD 4.9