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