Divide the following polynomial:
(9x 4 + 3x 3 y - 5x 2 y 2 + xy 3) (3x 3 + 2x 2 y - xy 2)
(9x 4 + 3x 3 y - 5x 2 y 2 + xy 3) (3x 3 + 2x 2 y - xy 2)