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   tan

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

   Description
   Return the tangent x. Where x is measured in radians.

   Example
   #include <stdio.h>
   #include <math.h>
   main()
   {
   double d = .45987;
        printf("The tangent of .45987 is [%f]\n",tan(d));
   }

   Return Value
   Returns the tangent of x.