( u v 2 − 2 u v + u − v 2 + 2 v − 2 ) ( 2 u v 2 − 2 u v + u − v 2 + 2 v − 1 ) u v 2 {\displaystyle {\frac {\left(uv^{2}-2uv+u-v^{2}+2v-2\right)\left(2uv^{2}-2uv+u-v^{2}+2v-1\right)}{uv^{2}}}}
