− ( v − 1 ) ( w − 1 ) ( 3 u v − 2 u + 2 v 2 − 3 v ) u v 3 / 2 w {\displaystyle -{\frac {(v-1)(w-1)\left(3uv-2u+2v^{2}-3v\right)}{{\sqrt {u}}v^{3/2}{\sqrt {w}}}}}
