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