A) \[{{x}^{2}}+1\]
B) \[{{x}^{2}}+2x+2\]
C) \[{{x}^{4}}+2{{x}^{2}}+2\]
D) None of these
Correct Answer: C
Solution :
\[fof\,(x)=f\{f(x)\}={{({{x}^{2}}+1)}^{2}}+1={{x}^{4}}+2{{x}^{2}}+2.\]
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