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Gabriel喇叭: y = 1/x 在 [1, infinity) 绕 x 轴旋转。证明体积是 pi 并讨论表面积为何无限。
Gabriel喇叭: y = 1/x 在 [1, infinity) 绕 x 轴旋转。证明体积是 pi 并讨论表面积为何无限。
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