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ACOSH(P)		   POSIX Programmer's Manual		      ACOSH(P)

NAME
       acosh, acoshf, acoshl - inverse hyperbolic cosine functions

SYNOPSIS
       #include <math.h>

       double acosh(double x);
       float acoshf(float x);
       long double acoshl(long double x);

DESCRIPTION
       These  functions	 shall	compute the inverse hyperbolic cosine of their
       argument x.

       An application wishing to check for error situations should  set	 errno
       to  zero	 and  call  feclearexcept(FE_ALL_EXCEPT)  before calling these
       functions.  On return, if errno is non-zero or  fetestexcept(FE_INVALID
       |  FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error has
       occurred.

RETURN VALUE
       Upon successful completion, these functions shall  return  the  inverse
       hyperbolic cosine of their argument.

       For  finite  values of x < 1, a domain error shall occur, and  either a
       NaN (if supported),  or	  an  implementation-defined  value  shall  be
       returned.

       If x is NaN, a NaN shall be returned.

       If x is +1, +0 shall be returned.

       If x is +Inf, +Inf shall be returned.

       If  x  is  -Inf,	 a domain error shall occur, and either a NaN (if sup‐
       ported), or an implementation-defined value shall be returned.

ERRORS
       These functions shall fail if:

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

       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
       then   errno  shall  be	set  to	 [EDOM].  If  the  integer  expression
       (math_errhandling &  MATH_ERREXCEPT)  is	 non-zero,  then  the  invalid
       floating-point exception shall be raised.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       On   error,   the   expressions	(math_errhandling  &  MATH_ERRNO)  and
       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
       at least one of them must be non-zero.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       cosh() , feclearexcept() , fetestexcept() , the Base Definitions volume
       of IEEE Std 1003.1-2001, Section 4.18, Treatment	 of  Error  Conditions
       for Mathematical Functions, <math.h>

COPYRIGHT
       Portions	 of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating	System	Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003	by  the	 Institute  of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained	online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group		     2003			      ACOSH(P)
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