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Volume of revolution

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First, I can't tell the difference between the two. Both seem to indicate a region bounded by two or three certain functions or points.
I was wondering if anyone could give a step by step explanation of how to do
1. Volumes by Cylindrical Shells
2. Volumes by Disks and Washers.

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The solution is attached below in two files. the files are identical in content, only differ in format. The first is in MS Word format, while the ...

Solution Summary

The solution demonstrates three methods of evaluateing volume of a revolution of a function.