− 2 v 2 u 4 + v u 4 + 5 v 2 u 3 − 7 v u 3 + 2 u 3 − 6 v 2 u 2 + 11 v u 2 − 6 u 2 + 2 v 2 u − 7 v u + 5 u + v − 2 {\displaystyle -2v^{2}u^{4}+vu^{4}+5v^{2}u^{3}-7vu^{3}+2u^{3}-6v^{2}u^{2}+11vu^{2}-6u^{2}+2v^{2}u-7vu+5u+v-2}
