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Let f(x)={{:(xe^(ax) "," x le 0 ),(x+ax^...

Let `f(x)={{:(xe^(ax) "," x le 0 ),(x+ax^2-x^3 "," x gt 0 ):}`,where is a
positive constant .Then the interval in which f' (x ) is increasing is

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The correct Answer is:
`[-2/a, a/3]`
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