asin man page on Cygwin

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ASIN(3)				    NEWLIB			       ASIN(3)

NAME
       1.5 `asin', `asinf'--arc sine

SYNOPSIS
	    #include <math.h>
	    double asin(double X);
	    float asinf(float X);

DESCRIPTION
       `asin'  computes	 the inverse sine (arc sine) of the argument X.	 Argu‐
       ments to `asin' must be in the range -1 to 1.

	  `asinf' is identical to `asin',  other  than	taking	and  returning
       floats.

	  You can modify error handling for these routines using `matherr'.

RETURNS
       `asin' returns values in radians, in the range of -pi/2 to pi/2.

       If  X is not in the range -1 to 1, `asin' and `asinf' return NaN (not a
       number), set the global variable `errno' to `EDOM', and issue a `DOMAIN
       error' message.

	  You can change this error treatment using `matherr'.

SEE ALSO
       asin  is part of the library.  The full documentation for is maintained
       as a Texinfo manual.  If info and are properly installed at your	 site,
       the command

	      info

       will give you access to the complete manual.

NEWLIB				  April 2010			       ASIN(3)
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