Ellardorado's answer to Ok's Junior College 2 H2 Maths Singapore question.

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Ellardorado
Ellardorado's answer
20 answers (A Helpful Person)
Since it's with respect to the y axis, need to make all the curves in terms of y, and change the integral bounds to be in terms of y, not x.

Since it asks for 4 d.p. you can just push calculator once you obtain the integrals and correct bounds.