Let f and g be differentiable functions satisfying \[{g}'(a)=2,\] \[g(a)=b\] and \[fog=I\](identity function). Then \[f'(b)\] is equal to

Let f and g be differentiable functions satisfying \[{g}'(a)=2,\] \[g(

1.	Let f and g be differentiable functions satisfying \[{g}'(a)=2,\] \[g(a)=b\] and \[fog=I\](identity function). Then \[f'(b)\] is equal to
A.	\[\frac{1}{2}\]
B.	2
C.	\[\frac{2}{3}\]
D.	None of these
Answer» B. 2

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Let f and g be differentiable functions satisfying \[{g}'(a)=2,\] \[g(a)=b\] and \[fog=I\](identity function). Then \[f'(b)\] is equal to

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