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