− v 2 u 4 + 2 v u 4 + 5 v 2 u 3 − 10 v u 3 + 3 u 3 − 8 v 2 u 2 + 15 v u 2 − 8 u 2 + 3 v 2 u − 10 v u + 5 u + 2 v − 1 {\displaystyle -v^{2}u^{4}+2vu^{4}+5v^{2}u^{3}-10vu^{3}+3u^{3}-8v^{2}u^{2}+15vu^{2}-8u^{2}+3v^{2}u-10vu+5u+2v-1}
