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# Use differential calculus to find the maximum/minimum

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What's the volume in terms of h and r? Use this to get your equation for surface area entirely in terms of r (by re-rranging the volume formula for h and then plugging h into your surface area formula)

Then you can differentiate your surface formula which is now solely in terms of r with respect to r and then find the stationary points.

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Updated: September 19, 2016
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