cosh - hyperbolic cosine function


SYNOPSIS

       #include <math.h>

       double cosh(double x);


DESCRIPTION

       The  cosh()  function  returns the hyperbolic cosine of x,
       which is defined mathematically as (exp(x) + exp(-x)) / 2.


CONFORMING TO

       SVID 3, POSIX, BSD 4.3, ISO 9899


SEE ALSO

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