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integrate from 0 to 4 of x^2 dx 를 좌측 리만 합으로 n = 4 , Delta x = 1 을 이용해 추정하라
integrate from 0 to 4 of x^2 dx 를 좌측 리만 합으로 n = 4 , Delta x = 1 을 이용해 추정하라
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