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