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