Let r, , be spherical coordinates. If u(r, , ) satisfies 2 u = 0,

Let r, θ, Φ be spherical coordinates. If u(r, θ, Φ) satisfies ∇²u = 0, show that v(r, θ, Φ) = u(1/r, θ, Φ)/r satisfies ∇²v = 0.