− 2 v 2 u 4 + 3 v u 4 − u 4 + 5 v 2 u 3 − 9 v u 3 + 4 u 3 − 6 v 2 u 2 + 13 v u 2 − 6 u 2 + 4 v 2 u − 9 v u + 5 u − v 2 + 3 v − 2 {\displaystyle -2v^{2}u^{4}+3vu^{4}-u^{4}+5v^{2}u^{3}-9vu^{3}+4u^{3}-6v^{2}u^{2}+13vu^{2}-6u^{2}+4v^{2}u-9vu+5u-v^{2}+3v-2}
