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f and g are two differentiable funct...

f and g are two differentiable functions which satisfy the condition ` g'(a) = 2,g (a) =b and (f og) =I` identity function , then f'(b) is equal to

A

`(1)/(2)`

B

2

C

`(2)/(3)`

D

None

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The correct Answer is:
A
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