Calculus`FourierTransform`
The symbolic functions in Calculus`FourierTransform` have been added to the built-in Mathematica kernel.
The numerical functionality in Calculus`FourierTransform` is now available through the newly created Fourier Series Package.
To access functionality from the new Fourier Series Package, load FourierSeries`:
Version 5.2
This gives a numerical approximation to the Fourier transform of Exp(-t2)/(1+t) with respect to at :
Version 5.2