The function \( f(x)=\left(x^{2}+1\right) e^{-x} \) is decreasing in the interval....

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The function \( f(x)=\left(x^{2}+1\right) e^{-x} \) is decreasing in the
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interval
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(1) \( \quad(-\infty, 1) \)
(2) \( (1, \infty) \)
(3) \( (-\infty, \infty) \)
(4) None of these


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