− v 3 u 3 + 3 v 2 u 3 − 2 v u 3 + 2 v 3 u 2 − 7 v 2 u 2 + 5 v u 2 − u 2 − v 3 u + 5 v 2 u − 7 v u + 2 u − 2 v 2 + 3 v − 1 {\displaystyle -v^{3}u^{3}+3v^{2}u^{3}-2vu^{3}+2v^{3}u^{2}-7v^{2}u^{2}+5vu^{2}-u^{2}-v^{3}u+5v^{2}u-7vu+2u-2v^{2}+3v-1}
