NAME

     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),