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