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If the graph of the function `f(x)=(a^x-1)/(x^n(a^x+1))` is symmetrical about the y-axis ,then n equals (a)2 (b) `2/3` (c) `1/4` (d) `1/3`

A

`1//5`

B

`1//3`

C

`1//4`

D

`-1//3`

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A, B, D
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