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ATN returns the arctangent of a numeric expression.
 
ATN(numeric-expression)
    ■ The argument numeric-expression can be of any numeric type.
 
Usage Notes
    ■ ATN (arctangent) is the inverse of tangent (TAN) and takes the ratio
      of two sides of a right triangle (numeric-expression) and returns
      the corresponding angle. The ratio 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 equals 90 degrees.
    ■ ATN is calculated in single precision if numeric-expression is an
      integer or single-precision value. If you use any other numeric data
      type, ATN is calculated in double-precision.
    ■ To convert values from degrees to radians, multiply the angle
      (in degrees) times PI/180 (or .0174532925199433) where PI = 3.141593.
    ■ To convert a radian value to degrees, multiply it by 180/PI
      (or 57.2957795130824) where PI = 3.141593.