− 3 v u 4 + u 4 − 3 v 2 u 3 + 8 v u 3 − 4 u 3 + 5 v 2 u 2 − 11 v u 2 + 5 u 2 − 4 v 2 u + 8 v u − 3 u + v 2 − 3 v {\displaystyle -3vu^{4}+u^{4}-3v^{2}u^{3}+8vu^{3}-4u^{3}+5v^{2}u^{2}-11vu^{2}+5u^{2}-4v^{2}u+8vu-3u+v^{2}-3v}
