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Questions  

Let f, g and h be continuous functions on [0, a] such that f(x)=f(ax),g(x)=g(ax) and 3h(x)4h(ax)=5. Then 0af(x)g(x)h(x)dx

is equal to

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a
5/4
b
3/4
c
1
d
none of these

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detailed solution

Correct option is D

I=∫0a f(x)g(x)h(x)dx=∫0a f(a−x)g(a−x)h(a−x)dx=∫0a f(x){−g(x)}34h(x)−54dx74I=54∫0a f(x)g(x)dx⇒I=57I1where I1=∫0a f(x)g(x)dx=∫0a f(a−x)g(a−x)dx=∫0a f(x)[−g(x)]dx=−I1⇒2I1=0⇒I1=0Thus, I = 0.


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