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