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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$\displaystyle \left| \frac{\cos n}{n^3} \right| \leq \frac{1}{n^3}$
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