− v u 5 + 2 u 5 + 4 v u 4 − 7 u 4 − 7 v u 3 + 8 u 3 + 8 v u 2 − 7 u 2 − 7 v u + 4 u + 2 v − 1 {\displaystyle -vu^{5}+2u^{5}+4vu^{4}-7u^{4}-7vu^{3}+8u^{3}+8vu^{2}-7u^{2}-7vu+4u+2v-1}
