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JEE MAIN 2020
09-01-2020 S2
Question
Let $f$ and $g$ be differentiabel functions on $R$ such that fog is the identity function. If for some $\mathrm{a}, \mathrm{b} \in \mathrm{R}$, $\mathrm{g}^{\prime}(\mathrm{a})=5$ and $\mathrm{g}(\mathrm{a})=\mathrm{b}$, then $\mathrm{f}^{\prime}(\mathrm{b})$ is equal to :
Select the correct option:
A
1
B
5
C
$\frac{1}{5}$
D
$\frac{2}{5}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
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Mathematics
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