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