opensolaris man page for asin

asin(3M)						  Mathematical Library Functions						  asin(3M)

NAME
       asin, asinf, asinl - arc sine function

SYNOPSIS
       c99 [ flag... ] file... -lm [ library... ]
       #include <math.h>

       double asin(double x);

       float asinf(float x);

       long double asinl(long double x);

DESCRIPTION
       These functions compute the principal value of the arc sine of their argument x. The value of x should be in the range [-1,1].

RETURN VALUES
       Upon successful completion, these functions return the arc sine of x in the range [-pi/2, pi/2] radians.

       For finite values of x not in the range [-1,1], a domain error occurs and a NaN is returned.

       If x is NaN, NaN is returned.

       If x is +-0, x is returned.

       If x is +-Inf, a domain error occurs and a NaN is returned.

       For exceptional cases, matherr(3M) tabulates the values to be returned by asin() as specified by SVID3 and XPG3.

ERRORS
       These functions will fail if:

       Domain Error    The x argument is finite and not in the range [-1,1], or is +-Inf.

		       If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, the invalid floating-point exception is raised.

		       The asin() function sets errno to EDOM if x is not +-Inf or NaN and is not in the range [-1,1].

USAGE
       An  application	wanting  to  check  for  exceptions should call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if
       fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an exception  has  been  raised.  An  application  should
       either examine the return value or check the floating point exception flags to detect exceptions.

       An  application	can  also  set	errno  to 0 before calling asin(). On return, if errno is non-zero, an error has occurred. The asinf() and
       asinl() functions do not set errno.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       isnan(3M), feclearexcept(3M), fetestexcept(3M), math.h(3HEAD), matherr(3M), sin(3M), attributes(5), standards(5)

SunOS 5.11							    12 Jul 2006 							  asin(3M)