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