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ATN                      Arctangent

 y = ATN(numexpr)

    Returns, in radians, the angle whose tangent is numexpr.

     numexpr    A numeric expression.

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

      Notes:    If the argument is a double-precision expression, ATN
                returns a double-precision value. Otherwise single
                precision is returned.

See Also: COS SIN TAN
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