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