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Let f:RtoR be a differentiable function ...

Let `f:RtoR` be a differentiable function such that `f(x)=x^(2)+int_(0)^(x)e^(-t)f(x-t)dt`.
`f(x)` increases for

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The correct Answer is:
`f(x) = (x^(3))/(3) + x^(2)`
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