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Which of the following functions is an e...

Which of the following functions is an even 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))`

Text Solution

Verified by Experts

The correct Answer is:
C
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