Plotting 3D
with(plots):with(linalg):
implicitplot3d(x^2+y^2=4,x=-5..5,y=-5..5,z=-5..5,axes=normal);
implicitplot3d(x^2=y,x=-5..5,y=-5..5,z=-5..5,axes=normal);
implicitplot3d(x^2+y^2+4*z^2=9,x=-5..5,y=-5..5,z=-5..5,axes=normal,numpoints=100);
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