A complex expression is in rectangular form if it is of the form a + b·î where a and b are real-valued expressions.  For example, 2 + 3·î is in rectangular form but (2 + 3·î)² is not.

If a 2D-plot window is in rectangular plot mode, expressions are plotted in rectangular coordinatesRectangular_coordinates, and the position of the cross is displayed in rectangular coordinates.  Rectangular plot mode is indicated by the rectangular axes icon in the first pane of the 2D-plot window status bar.

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