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Bessel functions aren't supported (and even Excel supports them!)

Try

    BesselJ[1,2]//N
On mathematica I get

    $ /Applications/Mathematica.app/Contents/MacOS/MathKernel 
    Mathematica 8.0 for Mac OS X x86 (64-bit)
    Copyright 1988-2010 Wolfram Research, Inc.

    In[1]:= BesselJ[1,2]//N

    Out[1]= 0.576725
In excel, `BESSELJ(2,1)` is the same to 5 significant figures.


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