− ( u + v ) ( u 2 v 3 − 2 u 2 v 2 + 2 u 2 v + u v 4 − 4 u v 3 + 6 u v 2 − 4 u v + u + 2 v 3 − 2 v 2 + v ) u 3 / 2 v 5 / 2 {\displaystyle -{\frac {(u+v)\left(u^{2}v^{3}-2u^{2}v^{2}+2u^{2}v+uv^{4}-4uv^{3}+6uv^{2}-4uv+u+2v^{3}-2v^{2}+v\right)}{u^{3/2}v^{5/2}}}}
