− 2 v 2 u 4 + 3 v u 4 − u 4 + 7 v 2 u 3 − 12 v u 3 + 5 u 3 − 9 v 2 u 2 + 19 v u 2 − 9 u 2 + 5 v 2 u − 12 v u + 7 u − v 2 + 3 v − 2 {\displaystyle -2v^{2}u^{4}+3vu^{4}-u^{4}+7v^{2}u^{3}-12vu^{3}+5u^{3}-9v^{2}u^{2}+19vu^{2}-9u^{2}+5v^{2}u-12vu+7u-v^{2}+3v-2}
