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Find the interval(s) in which the follow...

Find the interval(s) in which the following functions are
(i) increasing
(ii) decreasing
`f(x) = (x + 2) e^(-x)`

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The correct Answer is:
Increasing in `(-infty, -1)` and decreasing in `(-1, infty)`
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ARIHANT PRAKASHAN-VERY SIMILAR TEST 8-Section B
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