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Re: Series problem


In article <4ojdna$5i8 at dragonfly.wolfram.com> Tommy Nordgren,
f85-tno at telesto.nada.kth.se writes:
>Cos[b x] Exp[-x^2]/(k^2+x^2) into a taylor series around 0.


Here is a solution to your problem:


In[4]:=
approx={Cos[b x]->Series[Cos[b x],{x,0,3}]//Normal}

Out[4]=
                  2  2
                 b  x
{Cos[b x] -> 1 - -----}
                   2

In[5]:=
Cos[b x] Exp[-x^2]/(k^2+x^2)/.approx

Out[5]=
       2  2
      b  x
  1 - -----
        2
-------------
  2
 x    2    2
E   (k  + x )


Regards,
Gennady

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