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