HA 10, problem 3c

[Shaghayegh A]

Does 3c want us to go through steps a and b in spherical coordinates, or just write u as a function of r, theta, and phi?

[Shentao YANG]

I think you can just plug in $x=\rho \sin(\phi)\cos(\theta)$, etc and the resulting $u$ will automatically satisfy the laplacian in spherical coordinate.

[Victor Ivrii]

Shentao is correct.