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ATN                      Arctangent

 y = ATN(numexpr)

    Returns, in radians, the angle whose tangent is numexpr. The value is
    returned in double precision.

     numexpr    A numeric expression.

   -------------------------------------------------------------------------

      Notes:    Remember that 2. radians is equal to 360 degrees.
                Therefore 1 radian is equal to 180/..
See Also: COS SIN TAN
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