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