Calculate the area when is rotated around the y-axis. This is the formula. But when I solve for y, I get a ±. Should I just take the +version?
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Replacing y by -y will just change dx/dy to -dx/dy and that is squared in your formula. So it really doesn't matter whether you use "y" or "-y".
Attempt: and
I have narrowed this down to finding the primitive of but I'm stuck there.
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