Question
Use the notation $r=\langle x, y\rangle$ and $r=\|\mathbf{r}\|=\sqrt{x^{2}+y^{2}}$$$\text { Find } \nabla\left(r^{3}\right)$$
Step 1
Step 1: First, we rewrite $r^{3}$ as $(x^{2}+y^{2})^{3/2}$. Show more…
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