Basically, you are summing up the positive volumes of infinitely thin discs from -R to R. Each infinitestimal disc has an area of pi*y^2 (with y being the positive radius of each disc), and a thickness dx Hence, geometrically, we are summing up the positive volumes of each disc.
The equation will also integrate the negative area so the total area under the graph will ultimately be zero.
(I am not an expert. Justa beginner)
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Basically, you are summing up the positive volumes of infinitely thin discs from -R to R.
Each infinitestimal disc has an area of pi*y^2 (with y being the positive radius of each disc), and a thickness dx
Hence, geometrically, we are summing up the positive volumes of each disc.
Integrals are too op for volumes and areas
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How are you going with your course?