Manual Reference Pages - ACOSH (3)
NAME
acosh, acoshf, acoshl - inverse hyperbolic cosine function
CONTENTS
Synopsis
Description
Errors
Colophon
SYNOPSIS
#include <math.h>
double acosh(double x );
float acoshf(float x );
long double acoshl(long double x );

Link with -lm .
Feature Test Macro Requirements for glibc (see
feature_test_macros (7)):

acosh ():

_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
acoshf (),
acoshl ():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The
acosh () function calculates the inverse hyperbolic cosine of
x ; that is the value whose hyperbolic cosine is x .
RETURN VALUE
On success, these functions return the inverse hyperbolic cosine of
x .
If
x is a NaN, a NaN is returned.

If
x is +1, +0 is returned.

If
x is positive infinity, positive infinity is returned.

If
x is less than 1,
a domain error occurs,
and the functions return a NaN.

ERRORS
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 less than 1
errno is set to
EDOM . An invalid floating-point exception
(FE_INVALID ) is raised.

CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double also conforms to
SVr4, 4.3BSD, C89.
SEE ALSO
asinh (3),
atanh (3),
cacosh (3),
cosh (3),
sinh (3),
tanh (3)
COLOPHON
This page is part of release 3.44 of the Linux
man-pages project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages /.

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