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2\pi \int_2^4 2y\,dy + 2\pi \int_4^8 y\cdot (2-\sqrt[3]{2(y-4)})\,dy
2\pi \int_2^4 2y\,dy + 2\pi \int_4^8 y\cdot (2-\sqrt[3]{2(y-4)})\,dy
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