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ParametricPlot3D[{rho*Cos[phi], rho*Sin[phi], rho^2*Cos[2*phi]}, {phi, 0, 2*Pi}, {rho, 0, 1}]
ParametricPlot3D[{rho*Cos[phi], rho*Sin[phi], rho^2*Cos[2*phi]}, {phi, 0, 2*Pi}, {rho, 0, 1}]
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