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 ATN(numeric-expression)
 
 Usage Notes
   ■ ATN (arctangent) is the inverse of tangent (TAN). ATN evaluates the
     ratio of two sides of a right triangle (numeric-expression) and returns
     the corresponding angle in radians. The expression evaluated is the
     ratio of the lengths of the side opposite the angle and the side
     adjacent to the angle. The arctangent is given in radians and is in the
     range -pi/2 to pi/2 radians, where pi = 3.141593 and pi/2 radians = 90
     degrees.
 
   ■ ATN is calculated in single precision if numeric-expression or angle is
     an integer or single-precision value. If you use any other numeric data
     type, they are calculated in double precision.