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