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