This is my first time using Maple and I want to use Maple to check the exact solution to a pde.

My pde is  -e(u_xx + u_yy) + a*u_x = x(1-p^2 *x)*sin(ly) and the exact solution is u(x,y) = (Ax^2 + Bx +C)*sin(ly)

where A = -p, B = (1-2aA)/p, C = (2eA - aB) and p = el^2

I tried the following in Maple,

pde := -e*(diff(u(x, y), x, x) + diff(u(x, y), y, y) )+ a*diff(u(x, y), x) - x*(-p^2*x + 1)*sin(l*y) = 0

and i get the result below which I don't understand.

How do I do the right thing in order to check my exact solution.

Thanks