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