differentiation

Question: Let f and g be differentiable functions satisfying $g'(a) = 2,$ $g(a) = b$ and $fog = I$(identity function). Then $f'(b)$ is equal to



1) $\frac{1}{2}$
2) 2
3) $\frac{2}{3}$
4) None of these
Solution: Explanation: Explanation
Implicit-function

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