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integrating from 0 to infinity for e^-x sin (ax)

i was wondering that if i use complex exponentials for this will it be the same as solving for ∫_0^∞ e^-x cos (ax) dx. Will it make any difference if there is sin instead of cos because i know how to solve for cos (ax) but i don't know if it makes any difference if the cos is replaced by a sin.. does it make any difference?

cheers