− 2 v 2 u 4 + 2 v u 4 + 5 v 2 u 3 − 9 v u 3 + 3 u 3 − 6 v 2 u 2 + 13 v u 2 − 6 u 2 + 3 v 2 u − 9 v u + 5 u + 2 v − 2 {\displaystyle -2v^{2}u^{4}+2vu^{4}+5v^{2}u^{3}-9vu^{3}+3u^{3}-6v^{2}u^{2}+13vu^{2}-6u^{2}+3v^{2}u-9vu+5u+2v-2}
