## The ppd, and the gun.

Given a parallelepiped with fixed surface area and a variable volume, prove that the maximum volume occurs when the parallelepiped is a cube. *Using calculus only.* A-cha-cha.

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Given a parallelepiped with fixed surface area and a variable volume, prove that the maximum volume occurs when the parallelepiped is a cube. *Using calculus only.* A-cha-cha.