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 sinh()                  Calculate Hyperbolic Sine

 #include   <math.h>

 double     sinh(x);                     Hyperbolic sine
 double     x;                           Angle, in radians

    sinh() calculates the hyperbolic sine of 'x' radians.

       Returns:     Hyperbolic sine 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:     Error handling can be modified with the matherr()
                    function.

                    OVERFLOW first occurs with 'x' greater than 7.0E2

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

    The following statements print the hyperbolic sine of pi/2 and 220 pi
    radians and check for overflow.

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

           main()
           {
               double hsine, pi = 3.1415926535;

               hsine = sinh(pi/2.0);
               printf("hyperbolic sine of pi/2 = %e\n", hsine);
               errno = 0;
               hsine = sinh(220.0 * pi);
               if (errno == ERANGE)
                   printf("ERANGE error in sinh()\n");
               printf("hyperbolic sine of 220 * pi = %e\n", hsine);
           }