− 2 u v 4 − 9 u v 3 + 13 u v 2 − 6 u v + u + v 5 − 6 v 4 + 13 v 3 − 9 v 2 + 2 v u v 5 / 2 {\displaystyle -{\frac {2uv^{4}-9uv^{3}+13uv^{2}-6uv+u+v^{5}-6v^{4}+13v^{3}-9v^{2}+2v}{{\sqrt {u}}v^{5/2}}}}
