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

Results 1 to 3 of 3

- October 19th 2010, 05:43 AM #1

- Joined
- Dec 2008
- Posts
- 288

## 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, 06:25 AM #2

- Joined
- Dec 2009
- Posts
- 226

- October 19th 2010, 07:35 AM #3

- Joined
- Dec 2008
- Posts
- 288