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4 * 1/2 * х^2 * sin60 + 4 * 1/2 * х^2 * sin150 + 2 * 1/2 * х^2 * sin90 = 1
4 * 1/2 * х^2 * sin60 + 4 * 1/2 * х^2 * sin150 + 2 * 1/2 * х^2 * sin90 = 1
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