− v 2 u 2 + 5 v u 2 − 2 u 2 + 3 v 2 u − 9 v u + 3 u − 2 v 2 + 5 v − 1 {\displaystyle -v^{2}u^{2}+5vu^{2}-2u^{2}+3v^{2}u-9vu+3u-2v^{2}+5v-1}
