Question: The top cover of a rectangular tools box in a garage is broken accidentally and is now open at top. The rectangular tools box's current

The top cover of a rectangular tools box in a garage is broken accidentally and is now open at top. The rectangular tools box's current volume is 45m^(3)as shown below. The tools box has a length x,width y and height h.
Show the total surface area of the tools box in terms of variables of x and y only.
Apply the partial differentiation method to determine dimensions of the tools box if the surface area desired is the relative minimum.

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