Area enclosed by the curve \( y=\left(x^{2}+2 x\right) e^{-x} \) and the positive \( x \)-axis i...

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Area enclosed by the curve \( y=\left(x^{2}+2 x\right) e^{-x} \) and the positive \( x \)-axis is
(a) 1
(b) 2
(c) 4
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