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