what-is-2-1-r-if-i-x-j-y-k-z-and-r-i-x-j-y-k-z-

Question Number 87682 by john santu last updated on 05/Apr/20

what is ▽^{2} (\frac{1}{\vec{r}}) if

\vec{▽} = \hat{i} \frac{\partial}{\partial x} + \hat{j} \frac{\partial}{\partial y} + \hat{k} \frac{\partial}{\partial z}

and \vec{r} = \hat{i x} + \hat{j y} + \hat{k z}