2. Details of plot3d

• You do not need to do any programming or subdividing of parameter intervals; the package does that for you.

• If your plot is too coarse, with curves made of too few line segments, you can use plot3d($\cdots$,numpoints = 900); (say).

• If your plot involves circles and they are being plotted as ellipses, that means the plotting package is scaling the axes independently; you can use plot3d($\cdots$,scaling = CONSTRAINED); or select Constrained from the plot menu.

• You can get additional information from the help menu.

• If your plot is empty, check the ranges a..b used and make sure you didn't have a misprint like sint for sin(t), as cautioned above.