2 u 2 v 2 − 2 u 2 v − 4 u v 2 + 7 u v − 4 u − 2 v + 2 u v {\displaystyle {\frac {2u^{2}v^{2}-2u^{2}v-4uv^{2}+7uv-4u-2v+2}{uv}}}
