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Differentiation question

2020 · 9 Jan · Shift 2 · Q39

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PYQ Library
JEE Main
Mathematics
Differentiation
2020 · 9 Jan · Shift 2 · Q39

Differentiation question

2020 · 9 Jan · Shift 2 · Q39

JEE MainMathematicsDifferentiationMCQ+4 / −1

Let ƒ and g be differentiable functions on R such that fog is the identity function. If for some a, b

\in

R, g'(a) = 5 and g(a) = b, then ƒ'(b) is equal to :

A
1
B
5
C
${2 \over 5}$
D
${1 \over 5}$

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