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acos(3M)		Mathematical Library Functions		      acos(3M)

       acos, acosf, acosl - arc cosine functions

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

       double acos(double x);

       float acosf(float x);

       long double acosl(long double x);

       These functions compute the principal value of the arc cosine of x. The
       value of x should be in the range [−1,1].

       Upon successful completion, these functions return the arc cosine of  x
       in the range [0, pi] radians.

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

       If x is NaN, NaN is returned.

       If x is +1, +0 is returned.

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

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

       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 acos() function sets errno to EDOM if x is not ±Inf
		       or NaN and is not in the range [−1,1].

       An  application	wanting to check for exceptions should call feclearex‐
       cept(FE_ALL_EXCEPT) before  calling  these  functions.  On  return,  if
       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  acos().  On
       return,	if  errno  is non-zero, an error has occurred. The acosf() and
       acosl() functions do not set errno.

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

       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       │Interface Stability	     │Standard			   │
       │MT-Level		     │MT-Safe			   │

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

SunOS 5.11			  12 Jul 2006			      acos(3M)

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