COSH
Section: Linux Programmer's Manual (3)
Updated: 20100920
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NAME
cosh, coshf, coshl  hyperbolic cosine function
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 floatingpoint exception
(FE_OVERFLOW)
is raised.
CONFORMING TO
C99, POSIX.12001.
The variant returning
double
also conforms to
SVr4, 4.3BSD.
BUGS
In glibc version 2.3.4 and earlier,
an overflow floatingpoint
(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 3.74 of the Linux
manpages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
http://www.kernel.org/doc/manpages/.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 RETURN VALUE

 ERRORS

 CONFORMING TO

 BUGS

 SEE ALSO

 COLOPHON
