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Which of the following functions is an o...

Which of the following functions is an odd function ?
i) `f(x)=sqrt(1+x+x^(2))-sqrt(1-x+x^(2))`
ii) `f(x)=x((a^(x)+1)/(a^(x-1)))`
iii) `f(x)=log((1-x^(2))/(1+x^(2)))`
iv) `f(x)=k`, k is a constant

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