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asinf(3)

NAME

     asin, asinf -- arc sine functions

LIBRARY

     Math Library (libm, -lm)

SYNOPSIS

     #include <math.h>

     double
     asin(double x);

     float
     asinf(float x);

DESCRIPTION

     The asin() and the asinf() functions compute the principal value of the
     arc sine of x.  A domain error occurs for arguments not in the range [-1,
     +1].  For a discussion of error due to roundoff, see math(3).

RETURN VALUES

     The asin() and the asinf() 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() function conforms to ISO/IEC 9899:1990 (``ISO C90'').

FreeBSD 5.4		       January 14, 2005 		   FreeBSD 5.4

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