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The semi-vertical angle of the cone of m...

The semi-vertical angle of the cone of maximum curved surface area that can be inscribed in a given sphere of radius R is: (A) `tan^-1(1/2)` `(B) tan^-1(1/sqrt2)` (C) `tan^-1(1/2sqrt2)` (D) `tan^-1(1/4)`

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