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7.1.6 ATAN
The ATAN function returns a numeric value in radians that approximates the arctangent of the argument specified.
The function type is numeric. 



    ___ Format _____________________________________________________________ 
   |                                                                        |
   | >>__FUNCTION ATAN__(argument-1)_____________________________________>< |
   |                                                                        |
   |________________________________________________________________________|
argument-1
Must be class numeric.
The returned value is the approximation of the arctangent of argument-1 and is greater than -Pi/2 and less than +Pi/2.

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