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81. Let f(x) = 0 if x is any rational number and f (x) = 1 if x is any irrational number. Show that f

81. Let f(x) = 0 if x is any rational number and f (x) = 1 if x is any irrational number. Show that f is not integrable on [0, 1]. 82. Let f(0) = 0 and f(x) = 1/xif0

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