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