Solución

a.  V(r,h)=πr2h      b.  Vr=2πrh      c.  Vh=πr2a.\; V(r,h)=\pi r^2h\;\;\; b.\; \frac{\partial V}{\partial r}=2\pi rh\;\;\; c.\; \frac{\partial V}{\partial h}=\pi r^2