Which of the following functions is an e...

Which of the following functions is an eve~ function?

A

`f (x) = (a ^(x) + a ^(-x))/( a ^(x) - a ^(-x))`

B

`f (x) = (a ^(x) +1)/( a ^(x) -1)`

C

`f (x) = x. (a^(x)-1)/( a ^(x) +1)`

D

`f (x) = log _(2) (x + sqrt (x ^(2) + 1 ))`

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The correct Answer is:

C

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