− 4 v 2 u 2 + 6 v u 2 − 2 u 2 + 6 v 2 u − 11 v u + 6 u − 2 v 2 + 6 v − 4 {\displaystyle -4v^{2}u^{2}+6vu^{2}-2u^{2}+6v^{2}u-11vu+6u-2v^{2}+6v-4}
