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A cylindrical drill with radius r1 is used to bore vertically a hole through the centre of a sphere of radius r2.a) Find the volume of the...

A cylindrical drill with radius r1 is used to bore vertically a hole through the centre of a sphere of radius r2.a) Find the volume of the ring-shaped solid that remains.
b) Express the volume in part a) in terms of the height h of the ring.

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