− ( w − 1 ) ( 2 u v w 3 − 4 u v w 2 + 2 u v w + 4 u w 2 − 3 u w + u + v w 4 − 3 v w 3 + 4 v w 2 + 2 w 3 − 4 w 2 + 2 w ) u v w 5 / 2 {\displaystyle -{\frac {(w-1)\left(2uvw^{3}-4uvw^{2}+2uvw+4uw^{2}-3uw+u+vw^{4}-3vw^{3}+4vw^{2}+2w^{3}-4w^{2}+2w\right)}{{\sqrt {u}}{\sqrt {v}}w^{5/2}}}}
