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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`:
This gives a numerical approximation to the Fourier transform of Exp(-t2)/(1+t) with respect to at :