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I tried the following in Mathematica 5.0 trial version for Windows and
got the following unexpected result:
In[1]:=
Thread[FourierTransform[{Tanh[x], ArcTan[x]},x,f]]
Out[1]={I*Sqrt[Pi/2]*Csch[(f*Pi)/2], 0}

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
always 0!

Version 4.2 gives correct result.

Thanks.

Art

I tried the following in Mathematica 5.0 trial version for Windows and
got the following unexpected result:
In[1]:=
Thread[FourierTransform[{Tanh[x], ArcTan[x]},x,f]]
Out[1]={I*Sqrt[Pi/2]*Csch[(f*Pi)/2], 0}

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
always 0!

Version 4.2 gives correct result.

Thanks.

Art