I am stuck on this problem.(adsbygoogle = window.adsbygoogle || []).push({});

Use these equations:

[tex]\textbf{v}(\textbf{r}) = f(r)\textbf{r}[/tex]

[tex]\frac{\partial r}{\partial x} = \frac{x}{r}[/tex]

And the chain rule for differentiation, show that:

[tex](\nabla\cdot\textbf{v}) = 2f(r) + r\frac{df}{dr}[/tex]

(cylindrical coordinates)

Any help greatly appreciated, I will post my progres so far in a following post.

Cheers

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# Divergence in spherical coordinates

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