− 2 u 2 v 2 − 6 u 2 v + 5 u 2 − 6 u v 2 + 13 u v − 6 u + 5 v 2 − 6 v + 2 u v {\displaystyle -{\frac {2u^{2}v^{2}-6u^{2}v+5u^{2}-6uv^{2}+13uv-6u+5v^{2}-6v+2}{uv}}}
