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If a le 0 f(x) =e^(ax)+e^(-ax) and S={x:...

If a le 0 f(x) =e^(ax)+e^(-ax)` and S={x:f(x) is monotonically increasing then S equals

A

`S = {x : x gt 0}`

B

`S= {x : x lt 0}`

C

`S= {x : x gt 1}`

D

`S = {x : x lt 1}`

Text Solution

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The correct Answer is:
B
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