1) Let f be integrable on an interval [a, b] (with a < b). Let m and M be the infimum and surpemum of f on [a, b], respectively. Prove, from the definition of integral that m(b – a) < | f(x) dr < M(b – a).

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A: Here the lower limit is v and upper limit is w.   The function f(x) = u

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