− 2 v 2 u 4 + 5 v 2 u 3 − 4 v u 3 − 4 v 2 u 2 + 7 v u 2 − 4 u 2 − 4 v u + 5 u − 2 {\displaystyle -2v^{2}u^{4}+5v^{2}u^{3}-4vu^{3}-4v^{2}u^{2}+7vu^{2}-4u^{2}-4vu+5u-2}