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when the radius is decreasing and the height is increasing?

i have to calculate the partial derivatives, right? but then do i add the values?

like V = partial derivative height + partial derivative radius??

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    To find the rate of change as the height changes, solve the equation for volume of a cone ($\frac{\pi r^2 h}{3}$) for h, and find the derivative, using the given radius. For the rate of change as the radius changes - same idea.2012-11-11

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