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 cosh()                  Calculate Hyperbolic Cosine

 #include <math.h>

 double     cosh(x);                     Hyperbolic cosine
 double     x;                           Radians

    cosh() returns the hyperbolic cosine of 'x' radians.


       Returns:     Hyperbolic cosine of 'x'.  If the result is too
                    large, matherr() is called with an OVERFLOW error,
                    'errno' (defined in <errno.h>) is set to ERANGE
                    (defined in <errno.h>), and the value 'HUGE_VAL"
                    (defined in <math.h>) is returned.


         Notes:     OVERFLOW first occurs with 'x' greater than 7.0E2.

                    Error handling can be modified with the matherr()
                    function.

   -------------------------------- Example ---------------------------------

    The following statements print the hyperbolic cosine of pi and 240 pi
    radians, and check for overflow.

           #include <math.h>        /* for cosh() and ERANGE */
           #include <stdio.h>       /* for printf() */
           #include <errno.h>      /* for errno */

           main()
           {
               double hcosine, pi = 3.1415926535;

               hcosine = cosh(pi);
               printf("hyperbolic cosine of pi = %e\n", hcosine);
               errno = 0;
               hcosine = cosh(240.0 * pi);
               if (errno == ERANGE)
                   printf("ERANGE error in cosh()\n");
               printf("hyperbolic cosine of 240 * pi = %e\n", hcosine);
           }