I would like to calculate the integral(adsbygoogle = window.adsbygoogle || []).push({});

\begin{equation}

\int \frac{1}{|\mathbf y|} \nabla \frac{1}{|\mathbf y -\mathbf c|}~d^3\mathbf y,

\end{equation}

but I do not know how. I was wondering whether somebody has encountered such integral already. Do you know how to calculate it? Do you know some resource where similar integrals are calculated or tabulated ?

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# Integral 1/r grad 1/r

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