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