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