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Manual

acosh

NAME
LIBRARY
SYNOPSIS
DESCRIPTION
RETURN VALUE
ERRORS
ATTRIBUTES
STANDARDS
HISTORY
SEE ALSO

NAME

acosh, acoshf, acoshl - inverse hyperbolic cosine function

LIBRARY

Math library ( libm , -lm )

SYNOPSIS

#include <math.h>

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

Feature Test Macro Requirements for glibc (see feature_test_macros (7)):

acosh ():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| _XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

acoshf (), acoshl ():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE

DESCRIPTION

These functions calculate 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.

ATTRIBUTES

For an explanation of the terms used in this section, see attributes (7).

Image grohtml-298479-1.png

STANDARDS

C11, POSIX.1-2008.

HISTORY

C99, POSIX.1-2001.

The variant returning double also conforms to SVr4, 4.3BSD.

SEE ALSO

asinh (3), atanh (3), cacosh (3), cosh (3), sinh (3), tanh (3)