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