acosh man page on SmartOS

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acosh(3M)		Mathematical Library Functions		     acosh(3M)

       acosh, acoshf, acoshl - inverse hyperbolic cosine functions

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

       double acosh(double x);

       float acoshf(float x);

       long double acoshl(long double x);

       These functions compute the inverse hyperbolic cosine of their argument

       Upon successful completion, these functions return the  inverse	hyper‐
       bolic cosine of their argument.

       For finite values of  x < 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, +Inf 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 acosh() as specified by SVID3 and XPG3.

       These functions will fail if:

       Domain Error    The x argument is finite and less than 1.0, or is −Inf.

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

		       The acosh() function sets errno to EDOM if  x  is  less
		       than 1.0.

       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  acosh().  On
       return,	if  errno is non-zero, an error has occurred. The acoshf() and
       acoshl() 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			   │

       cosh(3M),  feclearexcept(3M),  fetestexcept(3M),	 math.h(3HEAD),	 math‐
       err(3M), attributes(5), standards(5)

SunOS 5.11			  12 Jul 2006			     acosh(3M)

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