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Please show each step of solving the problem below: A right circular cylindrical can is to have a volume of 90 cubic inches. Find the
Please show each step of solving the problem below:
A right circular cylindrical can is to have a volume of 90 cubic inches. Find the height h and the base radius r such that
(a) the surface area of the can is minimum
(b) the cost of the can is minimum, given that the top and bottom cost 5 per square inch and the lateral surface area costs 3 per square inch.
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