If int0^t(bxcos4x-asin4x)/(x^2)=(asin4t)...

If `int_0^t(bxcos4x-asin4x)/(x^2)=(asin4t)/t-1` where `0lttltpi/4,` then the values of `a , b` are, respectively, equal to (A) `1 /4,1` (B) `-1,4` (C) `2,2` (D) `2, 4`

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