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Let f : [1, ) R be a differentiable function such that f(1) = 3 1 and ). , 1 [ x , 3 x ) x ( xf dt ) t ( f 3 x 1 3 Let e denot e the base of the natural logarithm. Then the value of f(e) is
- 3 4 e 2
- 3 e 4 log e
- 3 e 4 2
- 3 4 e 2
Correct answer: 3 e 4 2
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