2f(x)=f(xy)+f(xy), x,y∈R+ If f(1)=0 and f′(2)=256, then f′(256 – InterviewSolution

1.	2f(x)=f(xy)+f(xy), x,y∈R+ If f(1)=0 and f′(2)=256, then f′(256) is equal to
Answer» $2 f (x) = f (x y) + f (\frac{x}{y}), x, y \in R^{+}$ If $f (1) = 0$ and $f^{'} (2) = 256,$ then $f^{'} (256)$ is equal to

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