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| Hello all! I'm currently finding my way through Mathematica (novice here), and am having issues "filling in" a Parametric3DPlot, as shown below: ParametricPlot3D[{(1 + Cos[(8 t)]) Cos[t], (1 + Cos[8 t]) Sin[t], u}, {t, 0, 2 Pi}, {u, 0,... |