If f(x)=(f(x))/y+(f(y))/x holds for all ...

If `f(x)=(f(x))/y+(f(y))/x` holds for all real `x` and `y` greater than `0a n df(x)` is a differentiable function for all `x >0` such that `f(e)=1/e ,t h e nfin df(x)dot`

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