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**[SOLVED] Laplace equation, cylindrical 2D**

**1. Homework Statement**

I am given the Laplace eq. in cylindrical coord. (2D), and I am told that we can assume the solution u(rho, Phi) = rho^n * Phi(phi).

Find the general solution.

**3. The Attempt at a Solution**

My teacher says that the general solution is u(rh,Phi) = SUM [A*cos(...) + B*sin(...)]*rho^n.

It is tis version of the Laplace equation on the first equation on page 12 in here:

http://people.ifm.liu.se/boser/elma/Lect4.pdf

Why do we not differentiate rho?