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   atan

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

   Description
   atan returns the arc tangent of x in the range of -pi/2 to pi/2.
   matherr can be used to modify error handling.

   Example
   #include <math.h>
   #include <stdio.h>
   main()
   {
   double x, y;
        x = 1.0;
        y = atan(x);
        printf("The arc tangent of %.7f is %.7f\n",x,y);
   }
   Return Value
   atan returns the arc tangent of its argument.