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(1 / 2)·4π·(4 / 2 + 1)^2 + (1 / 2)·4π·(4 / 2)^2 + π·[ (4 / 2 + 1)^2 - (4 / 2)^2 ] =
(1 / 2)·4π·(4 / 2 + 1)^2 + (1 / 2)·4π·(4 / 2)^2 + π·[ (4 / 2 + 1)^2 - (4 / 2)^2 ] =
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