To convert this to rectangular form, we can use the relationships $x = r\cos\theta$ and $y = r\sin\theta$. Since $r = 0$, we have:
$x = 0\cos\theta = 0$ and $y = 0\sin\theta = 0$
So, the rectangular form is:
$\boxed{x = 0, y = 0}$
(b) The polar equation is
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