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Math Help - Question about how complex poles are derived

  1. #1
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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. #2
    MHF Contributor FernandoRevilla's Avatar
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    (2\zeta w_n)^2-4w_n^2=4w_n^2(\zeta^2-1) etc.
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  3. #3
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    Thank you mate
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