− u v 3 − 4 u v 2 + 6 u v − 2 u − 2 v 3 + 6 v 2 − 4 v + 1 u v 3 / 2 {\displaystyle -{\frac {uv^{3}-4uv^{2}+6uv-2u-2v^{3}+6v^{2}-4v+1}{{\sqrt {u}}v^{3/2}}}}
