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