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Question

If f(x)=x1x2, then (fof)(x)=

A
x1x2
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B
x12x2
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C
x13x2
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D
x
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Solution

The correct option is D x12x2
fof(x)=f(f(x))=(x/1x2)/(1(x2/(1x2)))
=(x/1x2)/(1x2x2)/(1x2)
=(x/1x2)/(12x2/1x2)
=x/12x2

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