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Question

Evaluate the integral
baf(x)f(x)+f(a+bx)dx

A
ab
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B
ba
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C
ba2
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D
ab2
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Solution

The correct option is B ba2
I=baf(x)f(x)+f[(a+b)x]dx
bag(x)dx=bag[(a+b)x]dx
I=baf[(a+b)x]f[(a+b)x]+f(x)dx
=2I=ba1dx
I=ba2

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