LaTeX Solve Laplace's equation ∆u = 0, in cylindrical coordinates, subject to the boundary conditions u(ρ,0,z) = 0, u(ρ,a,z) = h(ρ,z) and u(ρ,θ,z) = g(ρ,z), where h(ρ,z) and g(ρ,z) are known functions