The 3D graph shows the motion of a freeswinging
pendulum.
The graph on the upper right is the xcoordinate
(red axis on 3D graph) vs. time, and the lower right graph is
the ycoordinate (green axis on 3D graph) vs. time. The two time
graphs together show how the greatest excursion of the pendulum
moved between the x and ycoordinates. The pendulum swung in
an ellipse that rotated in time.
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