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Let into^x(bt cos 4t - a sin 4t)/t^2 dt ...

Let `int_o^x(bt cos 4t - a sin 4t)/t^2 dt = (a sin 4x)/x` then a and b are given by 1) a=1/4, b = 1 2)a=2,b=2 3) a= -1, b=4 4)a=2,b=4

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