This video covers an extension to the calculus concept of volumes of rotation/revolution. The integral that is solved in the video is quite challenging and done quickly. If you wish to go through the answers at your own pace, use: integralcalculator.com, and copy paste: 4/3pi*(sqrt(r^2x^2))^3. This was the website I used to help me solve this integral.

Note: There is a small mistake at the very beginning. The y^2 is just supposed to be y after it becomes subject of formula

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