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A bell tent consists of a conical portio...

A bell tent consists of a conical portion above a cylindrical portion near the ground. For a given volume and a circular base of a given radius, the amount of the canvas used is a minimum when the semi-vertical angle of the cone is `cos^(-1)2/3` (b) `sin^(-1)2/3` `cos^(-1)1/3` (d) none of these

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CENGAGE PUBLICATION-APPLICATION OF DERIVATIVES-All Questions
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