(where is my my last post ?)
you can indirectly get :
>./sage
--------------------------
| SAGE Version 3.1.1 ...
| Type notebook()....
------------------------------
sage: var('a b t x')
(a, b, t, x)
sage: assume(b<0)
sage: expr(x)=integral(exp(-2*I*pi*(a+I*b)*t),t,0,x)
sage: factor(limit(expr(x),x=infinity)
-1*I/(2*pi*(I*b+a))
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