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