Let lim(in rarr 0+) int(in)^(x) (bt cos ...

Let `lim_(in rarr 0+) int_(in)^(x) (bt cos 4t- a sin 4t)/(t^(2)) dt= (a sin 4x)/(x)- 1, (0 lt x lt pi//4)`. Then a and b are given by

A

a= 2, b= 2

B

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

C

`a= -1, b= 4`

D

`a= 2, b= 4`

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