InterviewSolution
`f(x)=log""(1-x)/(1+x)``f(x)=x.(a^(x)+1)/(a^(x)-1)``f(x)=log[x+SQRT(1+x^(2))]``f(x)=sqrt((1+x+x^(2)))-sqrt((1-x+x^(2)))`
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