− v 2 u 6 + v u 6 + 2 v 2 u 5 − 4 v u 5 + u 5 − 3 v 2 u 4 + 6 v u 4 − 2 u 4 + 3 v 2 u 3 − 7 v u 3 + 3 u 3 − 2 v 2 u 2 + 6 v u 2 − 3 u 2 + v 2 u − 4 v u + 2 u + v − 1 {\displaystyle -v^{2}u^{6}+vu^{6}+2v^{2}u^{5}-4vu^{5}+u^{5}-3v^{2}u^{4}+6vu^{4}-2u^{4}+3v^{2}u^{3}-7vu^{3}+3u^{3}-2v^{2}u^{2}+6vu^{2}-3u^{2}+v^{2}u-4vu+2u+v-1}
