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If a lt 0, the function f(x)=e^(ax)+e^(-...

If `a lt 0`, the function `f(x)=e^(ax)+e^(-ax)` is decreasing for all values of x, where

A

A. `x gt 0`

B

B. `x lt 0`

C

C. `x gt 1`

D

D. `x lt 1`

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B
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