− ( u − 1 ) ( w − 1 ) 2 ( 2 v w 2 − v w + v + w 3 − w 2 + 2 w ) u v w 5 / 2 {\displaystyle -{\frac {(u-1)(w-1)^{2}\left(2vw^{2}-vw+v+w^{3}-w^{2}+2w\right)}{{\sqrt {u}}{\sqrt {v}}w^{5/2}}}}
