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