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If underset(0)overset(x)int (bt cos 4 t ...

If `underset(0)overset(x)int (bt cos 4 t - a sin 4t)/( t^(2))dt=(a sin 4x)/(x) "for all" x ne0` , then a and b are given by

A

`a=(1)/(4), b=1`

B

`a=2, b=2`

C

`a=-1b=4`

D

`a=2,b=4`

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The correct Answer is:
A
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