Hello;
I am a sage  newbie. I'd like to find out how to make Sage give me
this same result that I get in Mathematica.

This is what I typed (I do not know how to cut/paste from the VMWare
player console to her yet, so if there is a typo it is because of
this).

f=var('f')
assume(f>0)
integral(  e^(-I * 2 * pi * f * t), t , 0 , Infinity)

The answer I get starts with

limit(sin(2*pi*f*t),t,   etc...etc...


Is there a way to tell Sage to give me this answer I get from
Mathematica?

Assuming[Im[f] < 0, Integrate[Exp[(-I)*2*Pi*f*t], {t, 0, Infinity}]]
-(I/(2*f*Pi))

Thanks,
Nasser





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