Answer
$\pi$h($R^{}$+$r^{}$)(R-r)
Work Step by Step
V=$\pi$$R^{2}$h-$\pi$$r^{2}$h=
$\pi$h($R^{2}$-$r^{2}$)=$\pi$h($R^{}$+$r^{}$)(R-r)
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