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[" Let "f:R rarr R" be a differentiable function and "],[f(1)=4." Then the value of "lim_(x rarr1)int_(4)^(f(x))(2t)/(x-1)dt],[" is "],[[" (a) "8f'(1)," (b) "4f'(1)],[" (c) "2f'(1)," (d) "f'(1)]]

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