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Question

If f:RR be given by f(x)=(3x3)1/3, then find f(f(x)) is

A
x1/3
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B
x3
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C
x
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D
3x3
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Solution

The correct option is D x
f(x)=(3x3)13f(f(x))=f((3x3)13)
=(3((3x3)13)3)13=x

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