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A cross-section is a washer with an inner radius of 8sin(x) - (-1) and an outer radius of 8cos(x) - -(1), so its area would be: A(x) = π[(8cos(x) + 1)^2 − (8sin(x) + 1)^2] = π[64cos^2(x) + 16cos(x) + 1 - 64sin^2(x) − 16sin(x) − 1] = π[64cos(2x) +
