− 2 v u 4 + 2 u 4 − 3 v 2 u 3 + 11 v u 3 − 7 u 3 + 9 v 2 u 2 − 17 v u 2 + 9 u 2 − 7 v 2 u + 11 v u − 3 u + 2 v 2 − 2 v {\displaystyle -2vu^{4}+2u^{4}-3v^{2}u^{3}+11vu^{3}-7u^{3}+9v^{2}u^{2}-17vu^{2}+9u^{2}-7v^{2}u+11vu-3u+2v^{2}-2v}
