ACotD:

Path: Math/Trigonometry

% Inverse cotangent with output in degrees. -90 deg <= s <= 90 deg

   Since version 1.
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   Form:
   z = ACotD( x )
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   ------
   Inputs
   ------
   x                  Argument (deg)

   -------
   Outputs
   -------
   z                  inverse tangent(a)

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