I have to find the Laplacian of the following scalar field, but I can't figure out how to convert it to Cartesian/spherical coordinates. $$ U(r)=A e^{-j\left(\vec{k} \cdot \vec{r}\right)}, $$ where $\vec{k}$ and $\vec{r}$ are vectors. Is there a way to solve this?
2026-03-25 18:48:13.1774464493
Laplacian of scalar field
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