If `f(x)=log_e((1-x)/(1+x));` prove that `f(a)+f(b)=f((a+b)/(1+a b))`
Channel: Doubtnut
Date: 2019-12-27

If `f(x)=log_e((1-x)/(1+x));` prove that `f(a)+f(b)=f((a+b)/(1+a b))`

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