MathGroup Archive 2004

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complex analysis problem in mathematica 3.0


i have a complex function:

H(s)=1 / (s^3 + 2s^2 + 2s + 1)

whan i replace "s" with j*w (j=sqrt(-1)) i get:

H=1 / (1 + j2w -2w^2 - jw^3)

i would like to get that function in shape of : 
H=something + j*something_else i.e. the complex
and real part apart.

i played with Re and Im,but it seems that the fact that
"w" is a variable confuses mathematica?!

i would reeeealy appreciate any help,and maybe perhaps some
links for me to learn to use mathematica better.



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