JEE Math Practice Question
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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