Test:348 QNo:4

IIT JEE Papers › Disucss Test Questions questions › Test:348 QNo:4

f(x)+f(y)=f\left(\frac{x+y}{1-4xy} \right) for x,y in R (4xy≠1)

\lim_{x\rightarrow 0}\frac{f(x)}{x}=2

find f'(1)

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