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