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Question #47,750

Q.Let f:[1, [ [2, [ ∞ → ∞ ∞ → ∞ ∞ → ∞ ∞ → ∞ be a differentiable function such that f '(2) 4 =. If x 3 1 6 f(t)dt 3xf(x) x 5, x 1 = − − ∀ ≥ = − − ∀ ≥ = − − ∀ ≥ = − − ∀ ≥ ∫ ∫ then the value f(2) of is: