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将 y = sin x 在 [0, pi] 上绕x轴旋转。（提示： sin^2 x = (1 - cos 2x)/2 。）
将 y = sin x 在 [0, pi] 上绕x轴旋转。（提示： sin^2 x = (1 - cos 2x)/2 。）
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