ATAN()
 To return the ARCTANGENT in degrees of a tangent value.
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 Syntax

      ATAN( <nTan> ) -> nDegree

 Arguments

      <nTan> is a numeric value representing a tangent value.

      NOTE: Since a parameter of greater than 1 result in a math overflow,
            this function returns 0 as a result instead of a math overflow.

 Returns

      ATAN() returns the arctangent value (reverse tangent) in degrees of
      <nTan>.

 Description

      ATAN() is a trigonometrical function that returns the arctangent value
      in degrees of a tangent value.

      For radians, see ATANR().

      Accuracy is to the twelfth decimal (i.e. .00000000001)

 Examples

      ? Str( ATAN(.707106781), 5,  2)  // returns 35.26
      ? Str( ATAN(.866025403), 5,  2)  // returns 40.89

 Files: CALC.LIB

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