Monopole and Dipole Terms of Electric potential (V) on Half Disk

[jkthejetplane]

Homework Statement

So this is from my last exam. I wanted to figure this out as we can get some credit back on a question plus finals are coming up.

Relevant Equations

On my attached attempt you can see the equations I use as well as a few of the professor's notes

 

[Dr Transport]

Calculate potential on the z axis in terms of a Legendre polynomials. Then the off axis expansion will follow.