freebsd man page for asin

ASIN(3) 						   BSD Library Functions Manual 						   ASIN(3)

NAME
     asin, asinf, asinl -- arc sine functions

LIBRARY
     Math Library (libm, -lm)

SYNOPSIS
     #include <math.h>

     double
     asin(double x);

     float
     asinf(float x);

     long double
     asinl(long double x);

DESCRIPTION
     The asin(), asinf(), and asinl() functions compute the principal value of the arc sine of x.

RETURN VALUES
     These functions return the arc sine in the range [-pi/2, +pi/2] radians.  If:

	   |x| > 1

     asin(x) raises an invalid exception and returns an NaN.

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

STANDARDS
     The asin(), asinf(), and asinl() functions conform to ISO/IEC 9899:1999 (``ISO C99'').

BSD
								   July 31, 2008							       BSD