I tried the following in Mathematica 5.0 trial version for Windows and
got the following unexpected result:
The second item is obviously wrong since the Fourier transform of
ArcTan is not zero. I tried other funcitons, it seems that whenever
Tanh[x] and ArcTan[x] show up together, the result of ArcTan[x] is
Version 4.2 gives correct result.