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