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