plot1=parametric_plot3d((cos(t),sin(t),cos(2*t)),(t,0,pi),color="#DC267F",thickness=2)+parametric_plot3d((cos(t),sin(t),cos(2*t)),(t,pi,2*pi),color="#FFB000",thickness=2)+parametric_plot3d((t,0,1),(t,-1,1),color="#648FFF",thickness=2)+arrow3d((-.1,0,1),(.1,0,1),color="#648FFF")+arrow3d((cos(pi/2),sin(pi/2),cos(2*pi/2)),((cos(pi/2+0.2),sin(pi/2+0.2),cos(2*(pi/2+0.2)))),color="#DC267F")+arrow3d((cos(3*pi/2),sin(3*pi/2),cos(2*3*pi/2)),((cos(3*pi/2+0.2),sin(3*pi/2+0.2),cos(2*(3*pi/2+0.2)))),color="#FFB000")

    
    
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