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Question

Let f be a non-constant continuous function for all x0. Let f satisfy the relation f(x)=f(ax)=1 for some aϵR+. Then I=a0dx1+f(x) is equal to

A
a
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B
a4
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C
a2
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D
f(a)
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Solution

The correct option is B a2
Given : f(x)=f(ax)=1
Let I=a0dx1+f(x)

=a0f(x)dx1+f(x)

=a01+f(x)11+f(x) dx
=a0dxa0dx1+f(x)
2I=a0dx
2I=|x|a0
I=a2

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