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Math Help - real analysis

  1. #1
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    real analysis

    Im stuck on this question,do i replace 2n by 2n+1
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  2. #2
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    Quote Originally Posted by asingh88 View Post
    Im stuck on this question,do i replace 2n by 2n+1

    It's hard to understand what' written there , but if it is what I think then that seriers converges absolutely: \sum^\infty_{n=0}\frac{\cos 2n}{2^n-5} , since \left|\frac{\cos 2n}{2^n-5}\right|\leq\frac{1}{2^n-5} ...

    Tonio
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