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