The volume V of a right circular cylinder of height 2 feet and radius r feet is V=V(r)=2pir^2, Find the instantaneous rate of change of the volume with respect to the radius r at r=3
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V = 2πr²
=> dV/dr = 4πr
i.e. dV/dr = 12π
:)>
=> dV/dr = 4πr
i.e. dV/dr = 12π
:)>