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The even function of the following is...

The even function of the following is

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

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The correct Answer is:
C
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