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