Quite often in an Extension 2 volumes question, the student will be asked to use a particular method to complete the problem, viz. shells or discs.
Every so often, a question will appear that gives a student complete liberty to choose the method of solution.
In such cases, be careful!
While some of the integration in the presentation below can be streamlined, it is still interesting to see how each method differs, and the length of time it would take to solve the problem under exam conditions.
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