− v 3 u 3 + 3 v 2 u 3 − 3 v u 3 + 3 v 3 u 2 − 9 v 2 u 2 + 8 v u 2 − 3 u 2 − 3 v 3 u + 8 v 2 u − 9 v u + 3 u − 3 v 2 + 3 v − 1 {\displaystyle -v^{3}u^{3}+3v^{2}u^{3}-3vu^{3}+3v^{3}u^{2}-9v^{2}u^{2}+8vu^{2}-3u^{2}-3v^{3}u+8v^{2}u-9vu+3u-3v^{2}+3v-1}
