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