Which of the following is a function who...

Which of the following is a function whose graph is symmetrical about the origin ?

A

`f(x)=(2^(x)+2^(-x))`

B

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

C

`f(x+y)=f(x)+f(y)AA x,y in R`

D

None of these

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The correct Answer is:

C

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