− 2 u 3 v 2 + 2 u 3 v − u 3 − 2 u 2 v 3 + 6 u 2 v 2 − 6 u 2 v + 2 u 2 + 2 u v 3 − 6 u v 2 + 6 u v − 2 u − v 3 + 2 v 2 − 2 v u 3 / 2 v 3 / 2 {\displaystyle {\frac {-2u^{3}v^{2}+2u^{3}v-u^{3}-2u^{2}v^{3}+6u^{2}v^{2}-6u^{2}v+2u^{2}+2uv^{3}-6uv^{2}+6uv-2u-v^{3}+2v^{2}-2v}{u^{3/2}v^{3/2}}}}