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반지름 r 인 원의 넓이가 pi r^2 임을 A = 4integrate from 0 to r of sqrt(r^2 - x^2) dx 를 계산하여 증명하세요
반지름 r 인 원의 넓이가 pi r^2 임을 A = 4integrate from 0 to r of sqrt(r^2 - x^2) dx 를 계산하여 증명하세요
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