If int0^1(sint)/(1+t)dt=alpha, then the ...

If `int_0^1(sint)/(1+t)dt=alpha,` then the value of the integral `int_(4pi-2)^(4pi)(sin(t/2))/(4pi+2-t)dt` is (1)`2alpha` (2) `-2alpha` (3) `alpha` (4) `-alpha`

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