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   tanh

   Usage
   #include <math.h>
   double tanh(double x);

   Description
   Return the hyperbolic tangent of x. x is measured in radians.

   Example
   #include <stdio.h>
   #include <math.h>
   main()
   {
   double d = .495;
        printf("The hyperbolic tan of .495 is [%f]\n",tanh(d));
   }

   Return Value
   Returns hyperbolic tangent of x.