यदि \( f(x)=\log \frac{1+x}{1-x} \), तो सिद्ध कीजिए कि \[ f\left(\frac{2 x}{1+x^{2}}\right)=2 f(...
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यदि \( f(x)=\log \frac{1+x}{1-x} \), तो सिद्ध कीजिए कि
\[
f\left(\frac{2 x}{1+x^{2}}\right)=2 f(x)
\]
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