To find the volume generated by rotating an area bounded by 2 curves f(x) and g(x) around the x-axis(adsbygoogle = window.adsbygoogle || []).push({});

we use the formula

Int of lower and upper intersections pi( f(x)^2-g(x)^2 ) dx

or

Int of lower and upper intersections pi (f(x)-g(x))^2 dx

I understand that they are different but i am confused when to use the correct formula.

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# Integration to find volume generated

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