− v u 5 + 4 v u 4 − 4 v u 3 + 2 u 3 + 2 v u 2 − 4 u 2 + 4 u − 1 {\displaystyle -vu^{5}+4vu^{4}-4vu^{3}+2u^{3}+2vu^{2}-4u^{2}+4u-1}
