− 4 u v 4 − 7 u v 3 + 8 u v 2 − 6 u v + 2 u + 2 v 5 − 6 v 4 + 8 v 3 − 7 v 2 + 4 v u v 5 / 2 {\displaystyle -{\frac {4uv^{4}-7uv^{3}+8uv^{2}-6uv+2u+2v^{5}-6v^{4}+8v^{3}-7v^{2}+4v}{{\sqrt {u}}v^{5/2}}}}
