− v 3 u 3 + 3 v 2 u 3 − 2 v u 3 + 3 v 3 u 2 − 8 v 2 u 2 + 6 v u 2 − 2 u 2 − 2 v 3 u + 6 v 2 u − 8 v u + 3 u − 2 v 2 + 3 v − 1 {\displaystyle -v^{3}u^{3}+3v^{2}u^{3}-2vu^{3}+3v^{3}u^{2}-8v^{2}u^{2}+6vu^{2}-2u^{2}-2v^{3}u+6v^{2}u-8vu+3u-2v^{2}+3v-1}
