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