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