− v 3 u 3 + 4 v 2 u 3 − 4 v u 3 + 2 u 3 + 2 v 3 u 2 − 6 v 2 u 2 + 6 v u 2 − 2 u 2 − 2 v 3 u + 6 v 2 u − 6 v u + 2 u + 2 v 3 − 4 v 2 + 4 v − 1 {\displaystyle -v^{3}u^{3}+4v^{2}u^{3}-4vu^{3}+2u^{3}+2v^{3}u^{2}-6v^{2}u^{2}+6vu^{2}-2u^{2}-2v^{3}u+6v^{2}u-6vu+2u+2v^{3}-4v^{2}+4v-1}
