COSH(3) | Linux Programmer's Manual | COSH(3) |
NAME
cosh, coshf, coshl - hyperbolic cosine functionSYNOPSIS
#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)):
_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.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 3.53 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 |