3. The disk and cylindrical shell methods for calculating the volume of a solid of revolution always give the same answer (when they are computable.) Show that this is true for the following case: find the volume of the solid generated by revolving the region bounded by the x-axis, y = mx, x = 0 and x = b around the x-axis (b, m positive numbers) in two different ways, by using disks and cylindrical shells. You should get the same formula.

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