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