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Math Help - Proving!

  1. #1
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    Proving!

    I really can't prove this, can you please show me how to do it?


    If z=cis delta, prove that z^n + \frac{1}{z^n} = 2cosn delta


    Thank you so much!
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  2. #2
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    Posts
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    Re: Proving!

    Ignore this, I got it! Thanks!
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