− 2 v u 4 + 2 u 4 − 3 v 2 u 3 + 11 v u 3 − 6 u 3 + 7 v 2 u 2 − 17 v u 2 + 7 u 2 − 6 v 2 u + 11 v u − 3 u + 2 v 2 − 2 v {\displaystyle -2vu^{4}+2u^{4}-3v^{2}u^{3}+11vu^{3}-6u^{3}+7v^{2}u^{2}-17vu^{2}+7u^{2}-6v^{2}u+11vu-3u+2v^{2}-2v}
