− 3 u 2 v 2 − 4 u 2 v + u 2 − 4 u v 2 + 9 u v − 4 u + v 2 − 4 v + 3 u v {\displaystyle -{\frac {3u^{2}v^{2}-4u^{2}v+u^{2}-4uv^{2}+9uv-4u+v^{2}-4v+3}{uv}}}
