Use differential calculus to find the maximum/minimum

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    (Original post by forxer)
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    Show your approach to this.

    (Original post by forxer)
    sorry I'm quiet new
    i will try to upload it again
    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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