2 Integrate[Sqrt[4 x - x^2], {x, 0, 1}] + 2 Integrate[Sqrt[4 - x^2], {x, 1, 2}]2 Integrate[Sqrt[4 x - x^2], {x, 0, 1}] + 2 Integrate[Sqrt[4 - x^2], {x, 1, 2}]

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