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