− u v 5 − 4 u v 4 + 4 u v 3 + 4 v 2 − 4 v + 1 u v 5 / 2 {\displaystyle -{\frac {uv^{5}-4uv^{4}+4uv^{3}+4v^{2}-4v+1}{{\sqrt {u}}v^{5/2}}}}
