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

       asin, asinf, asinl - arc sine function

       #include <math.h>

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

       Link with -lm.

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       asinf(), asinl():
	   _POSIX_C_SOURCE >= 200112L;
	   or cc -std=c99

       The asin() function calculates the principal value of the arc sine of x; that is the value
       whose sine is x.

       On  success,  these  functions return the principal value of the arc sine of x in radians;
       the return value is in the range [-pi/2, pi/2].

       If x is a NaN, a NaN is returned.

       If x is +0 (-0), +0 (-0) is returned.

       If x is outside the range [-1, 1], a domain error occurs, and a NaN is returned.

       See math_error(7) for information on how to determine whether an error has  occurred  when
       calling these functions.

       The following errors can occur:

       Domain error: x is outside the range [-1, 1]
	      errno is set to EDOM.  An invalid floating-point exception (FE_INVALID) is raised.

       C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

       acos(3), atan(3), atan2(3), casin(3), cos(3), sin(3), tan(3)

       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at

					    2010-09-20					  ASIN(3)
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