− ( u − 1 ) ( v − 1 ) ( u 2 v 4 − u 2 v 3 + u 2 v 2 + 2 u v 3 − 3 u v 2 + 2 u v + v 2 − v + 1 ) u 3 / 2 v 5 / 2 {\displaystyle -{\frac {(u-1)(v-1)\left(u^{2}v^{4}-u^{2}v^{3}+u^{2}v^{2}+2uv^{3}-3uv^{2}+2uv+v^{2}-v+1\right)}{u^{3/2}v^{5/2}}}}
