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\[ Prove\ that \ \nabla\cdot\left\{ \frac{f(r)}{r}\bar{r} \right \}= \frac{1}{r^2} \frac{d}{dr}\ [r^2f(r)] \]
hence or otherwise prove that div \[\left(r^n\bar{r}\right)=\left(n+3\right)r^n\]
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