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