plot3d ??!!

May 2010
9
0
plot3d ??!! plz help

1) r = Cos[3 t]
2) PolarPlot[Cos[3 t], {t, 0, Pi}, ImageSize -> Small]
3) x^2+y^2=z
4) x= Cos[3t]Cos[t]
5) y=Cos[3t]Sin[t]

set x and y in (3) >>>
6) (Cos[3t]Cos[t])^2+(Cos[3t]Sin[t])^2 =z

how to draw (6) in Plot3d???
 
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