It seems you forgot to mention what you are trying to show the sum is equivalent to.

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- October 19th 2010, 04:43 AM #1

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## sum of |(cos(n^10-16n^2))/n|

so i want to show that sum |(cos(n^10-16n^2))/n| from n=1 to n=infinity where n is a member of the natural numbers diverges, so if i show that the sequence of partial sums is unbounded then this is equivalent right? i was wondering if this is the right approach to take? (i would like to figure this out so i just want a little help not the full proof or anything thanks)

- October 19th 2010, 05:25 AM #2

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- October 19th 2010, 06:35 AM #3

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