A) \[\frac{1}{2}\]
B) 2
C) \[\frac{2}{3}\]
D) None of these
Correct Answer: A
Solution :
\[fog=I\Rightarrow fog(x)=x\]for all x Þ \[f'(g(x))g'x=1\]for all\[x\] Þ \[f'(g(a))=\frac{1}{g'(a)}=\frac{1}{2}\Rightarrow f'(b)=\frac{1}{2}\ \ \ \ \ \ (\because g(a)=b)\].You need to login to perform this action.
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