For u(x,y) defined on the rectangular domain of 1 ≤ x ≤ 2 and 0 ≤ y ≤ π, solve the PDE x² ∂²u/∂x² + ∂²u/∂y² - 2x ∂u/∂x = 0, with the boundary conditions (i) u(1, y) = 0 (ii) u(2, y) = 31 sin(2y) (iii) u(x, 0) = 0 (iv) u(x, π) = 0 For this problem, we expect a closed-form analytic solution that consists of only a finite number of terms and without any unevaluated integral. A deduction will be assessed on the solution otherwise.