यदि \( f(x)=\frac{x-1}{x+1} \), तो सिद्ध कीजिए कि \( \frac{f(b)-f(a)}{1+f(b) \cdot f(a)}=\frac{b...

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यदि \( f(x)=\frac{x-1}{x+1} \), तो सिद्ध कीजिए कि \( \frac{f(b)-f(a)}{1+f(b) \cdot f(a)}=\frac{b-a}{1+a b} \)
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