Question: This is a washer method problem, right? I was told that for washer method problems, after you put things in terms of y and set

This is a washer method problem, right? I was told that for washer method problems, after you put things in terms of y and set it up as "right function minus left function", you need to square both functions. Why doesn't that happen in this case? I've seen quite a few of these problems solved on Youtube, but, in every case, you're supposed to square both functions right before taking the antiderivative. I've already had this problem solved on Chegg, but they never square the functions before taking the antiderivative. Why would this problem be an exception to the rule?

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