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the interval in which the function f giv...

the interval in which the function f given by `f(x) = x^2 e^(-x)` is strictly increasing, is
(a) `( -(oo) , (oo) )`
(b) `( -(oo) , 0 )`
(c) `( 2 , (oo) )`
(d) ( 0 , 2 )

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