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Math Help - Convergence test

  1. #1
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    Convergence test

    Hi Folks

    I need to find out if the series converges: cos n/n^3. I think it is a harmonic series becouse of the power on the denomimator but how do I combine this with sinusiodal cos n?

    Has anyone ever seen this before?
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  2. #2
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    \left| \frac{\cos n}{n^3} \right| \leq \frac{1}{n^3}
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