− u v 3 − 6 u v 2 + 9 u v − 3 u − 3 v 3 + 9 v 2 − 6 v + 1 u v 3 / 2 {\displaystyle -{\frac {uv^{3}-6uv^{2}+9uv-3u-3v^{3}+9v^{2}-6v+1}{{\sqrt {u}}v^{3/2}}}}
