Let `f(x)=ln((1-x)/(1+x))` . Find x,y for which `f(x)+f(y)=f((x+y)/(1+xy))`

Explanation

To solve the equation \( f(x) + f(y) = f\left(\frac{x+y}{1+xy}\right) \) where \( f(x) = \ln\left(\frac{1-x}{1+x}\right) \), we will follow these steps:

### Step 1: Write down the function
The function is given by:
\[ f(x) = \ln\left(\frac{1-x}{1+x}\right) \]

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