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## NAME

acosh, acoshf,acoshl- inverse hyperbolic cosine function## 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 (seefeature_test_macros(7)):acosh(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; orcc -std=c99 acoshf(),acoshl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L; orcc -std=c99DESCRIPTION

Theacosh() function calculates the inverse hyperbolic cosine ofx; that is the value whose hyperbolic cosine isx.## RETURN VALUE

On success, these functions return the inverse hyperbolic cosine ofx. Ifxis a NaN, a NaN is returned. Ifxis +1, +0 is returned. Ifxis positive infinity, positive infinity is returned. Ifxis less than 1, a domain error occurs, and the functions return a NaN.## ERRORS

Seemath_error(7) for information on how to determine whether an error has occurred when calling these functions. The following errors can occur: Domain error:xis less than 1errnois set toEDOM. An invalid floating-point exception (FE_INVALID) is raised.## CONFORMING TO

C99, POSIX.1-2001. The variant returningdoublealso 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 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at //www.kernel.org/doc/man-pages/. 2010-09-20 ACOSHL(3)

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