A) \[{{x}^{3}}\]
B) \[{{x}^{2}}\]
C) \[x\]
D) None of these
Correct Answer: C
Solution :
\[f[f(x)]={{[a-{{\left\{ f(x) \right\}}^{n}}]}^{1/n}}={{[a-(a-{{x}^{n}})]}^{1/n}}=x\].
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