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)