Let \( f \) and \( g \) be differentiable functions on \( \mathrm{R... VIDEO
Let \( f \) and \( g \) be differentiable functions on \( \mathrm{R} \) such that fog is the identity function. If for some \( a, b \in R, g^{\prime}(a)= \)
\( \mathrm{P} \) 5 and \( g(a)=b \), then \( f^{\prime}(b) \) is equal to :
W.
[JEE Main-2020 (January)]
(1) \( \frac{1}{5} \)
(2) \( \frac{2}{5} \)
(3) 1
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