Manual Reference Pages - COSH (3)
NAME
cosh, coshf, coshl - hyperbolic cosine function
CONTENTS
Synopsis
Description
Errors
Bugs
Colophon
SYNOPSIS
#include <math.h>
double cosh(double x );
float coshf(float x );
long double coshl(long double x );

Link with -lm .

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

coshf (),
coshl ():

_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The
cosh () function returns the hyperbolic cosine of x , which
is defined mathematically as:
cosh(x) = (exp(x) + exp(-x)) / 2

RETURN VALUE
On success, these functions return the hyperbolic cosine of
x .
If
x is a NaN, a NaN is returned.

If
x is +0 or -0, 1 is returned.

If
x is positive infinity or negative infinity,
positive infinity is returned.

If the result overflows,
a range error occurs,
and the functions return
+HUGE_VAL ,
+HUGE_VALF , or
+HUGE_VALL , respectively.

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:

Range error: result overflow
errno is set to
ERANGE . An overflow floating-point exception
(FE_OVERFLOW ) is raised.

CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double also conforms to
SVr4, 4.3BSD.
BUGS
In glibc version 2.3.4 and earlier,
an overflow floating-point
(FE_OVERFLOW ) exception is not raised when an overflow occurs.
SEE ALSO
acosh (3),
asinh (3),
atanh (3),
ccos (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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