coshf man page on Oracle

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COSH(3)			   Linux Programmer's Manual		       COSH(3)

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);

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.

acosh(3), asinh(3), atanh(3), ccos(3), sinh(3), tanh(3)

COLOPHON
This  page  is  part of release 3.53 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/.

2010-09-20			       COSH(3)
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