− v 2 u 4 + 3 v u 4 − 2 u 4 + 5 v 2 u 3 − 11 v u 3 + 6 u 3 − 8 v 2 u 2 + 15 v u 2 − 8 u 2 + 6 v 2 u − 11 v u + 5 u − 2 v 2 + 3 v − 1 {\displaystyle -v^{2}u^{4}+3vu^{4}-2u^{4}+5v^{2}u^{3}-11vu^{3}+6u^{3}-8v^{2}u^{2}+15vu^{2}-8u^{2}+6v^{2}u-11vu+5u-2v^{2}+3v-1}
