SpaceCurve(0,2*pi,100,'2*cos(t)','2*sin(t)','4*cos(t).*sin(t)','b')
hold on
GraphZvsXY(-2,2,10,-2,2,10,'x.*y')
ParametricSurface(0,2*pi,20,-2,2,4,'2*cos(u)+0*v','2*sin(u)+0*v','0*u+v')
