Hi,
Indeed, this seems a bug in Sage.
Note that both SymPy and Giac return the correct answer:

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sage: integrate(sin(x)*exp(I*x), x, -pi, 0)
3/2*I*pi
sage: integrate(sin(x)*exp(I*x), x, -pi, 0, algorithm='sympy')
1/2*I*pi
sage: integrate(sin(x)*exp(I*x), x, -pi, 0, algorithm='giac')
1/2*I*pi
Eric.
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