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Which of the following function is an ev...

Which of the following function is an even function?

A

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

B

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

C

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

D

`f(x)=sin(x)`

Text Solution

Verified by Experts

The correct Answer is:
C
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