Question

$\frac{d}{dh}\left[\pi [r^{2}h+\frac{h^3}{4}]\right]$.

Answer 1

$\frac{d}{dh}\left[\pi [r^{2}h+\frac{h^3}{4}]\right]$

$\frac{d}{dh}[\pi r^{2}h+\frac{\pi h^3}{4}]$

$\Rightarrow \pi r^2+\frac{3\pi h^2}{4}$