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Let f:[1/2,1]->R (the set of all real n...

Let `f:[1/2,1]->R` (the set of all real numbers) be a positive, non-constant, and differentiable function such that `f^(prime)(x)<2f(x)a n df(1/2)=1` . Then the value of `int_(1/2)^1f(x)dx` lies in the interval (a)`(2e-1,2e)` (b) `(3-1,2e-1)` (c)`((e-1)/2,e-1)` (d) `(0,(e-1)/2)`

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