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六、Find the volume of the solid that is obtained when the region under the 666ff71710898.jpg over the interval [1, 4] is revolved about the x-axis.(求當區間 [1, 4] 下666ff737b2573.jpg圖形所圍成的區域繞 x 軸旋轉時所生成的固體體積。) (15 分)