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Math Help - Question about how complex poles are derived

  1. April 4th 2011, 09:02 AM #1
    hunterage2000
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    Question about how complex poles are derived

    Can someone please look at the attached pdf and tell me how the top part is siomplified to the bottom.
    Attached Thumbnails Attached Thumbnails Question about how complex poles are derived-2-n.pdf  
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  2. April 4th 2011, 09:07 AM #2
    FernandoRevilla
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    (2\zeta w_n)^2-4w_n^2=4w_n^2(\zeta^2-1) etc.
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  3. April 4th 2011, 09:18 AM #3
    hunterage2000
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    Thank you mate
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