− u 2 v 2 − 3 u 2 v + 3 u 2 − 3 u v 2 + 7 u v − 3 u + 3 v 2 − 3 v + 1 u v {\displaystyle -{\frac {u^{2}v^{2}-3u^{2}v+3u^{2}-3uv^{2}+7uv-3u+3v^{2}-3v+1}{uv}}}
