Sketch the curve with the given polar equation by first sketching the graph of r as a

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Sketch the curve with the given polar equation by first sketching the graph of r as a function of θ in Cartesion coordinates.
(a) r2 = 9 sin 2 θ
(b) r = 2 + sin 3 θ
(c) r= 1 + 2cos 2θ
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