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- paraPlot()
- paraplot() plots parametric curves of x=fx(t) and y=fy(t) on xy-plane.
- by default tmin:=0, tmax:=2*pi, ymin:=-5, ymax:=5, xmin:=ymin, xmax:=ymax
- e.g. paraplot(sin(t),sin(2*t), t) # x=sin(t), y=sin(2*t)
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