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cosh()                   Calculate Hyperbolic Cosine

 #include <math.h>

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

    cosh() return 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 <stdlib.h>) is set to ERANGE (defined in
                <math.h>), and the value 'HUGE" (defined in <math.h>) is
                returned.


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

                Error handling can be modified by using 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 <stdlib.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);
         }