xxxxxxxxxxvar('r,phi,z'); trans=(r*cos(phi),r*sin(phi),20*z)p=plot3d(cos(r),(r,0,20*pi/2),(phi,0,2*pi), transformation=trans,opacity=.7)p+plot3d(lambda x,y:.1^2*(x^2+y^2)-10, (-30,30),(-30,30), mesh=True,color='#ff3636',opacity=.3)
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