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