- #1
MaximumTaco
- 45
- 0
[tex]
\sum_{n=1}^\infty \frac{cos n}{n^2}
[/tex]
Now, which test should i try? It doesn't appear to be anything straightforward like ratio test, comparison test etc and it's not a straightforward limit.
cos(n) goes negative too, so that complicates things.
Can anyone offer me any advice on a problem like this? Thanks!
\sum_{n=1}^\infty \frac{cos n}{n^2}
[/tex]
Now, which test should i try? It doesn't appear to be anything straightforward like ratio test, comparison test etc and it's not a straightforward limit.
cos(n) goes negative too, so that complicates things.
Can anyone offer me any advice on a problem like this? Thanks!