libc.a reference
cosh
Syntax
 #include <math.h>
double cosh(double x);

Description
This function computes the hyperbolic cosine of x.
Return Value
The hyperbolic cosine of x. If the value of x is a
NaN
, the return value is NaN
and errno
is set to
EDOM
. If the value of x is so large that the result would
overflow a double
, the return value is Inf
and
errno
is set to ERANGE
. If x is either a positive
or a negative infinity, the result is +Inf
, and errno
is
not changed.
Portability
ANSI/ISO C 
C89; C99

POSIX 
1003.21992; 1003.12001
