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