Solution

I checked the solution. I forgot that it was + sin k and not - sin k (and this has been fixed). Was this your only problem with the solution? Or was there some other error?

Hi Robert,

I think the sum is bigger than a p-series, then it diverges.

Han

I think I made a typo and accidentally had the inequality going the wrong way. I've changed the solution again. Do you think this is better?

I think everything is fine now, thank you.

Thank you for pointing this out! I must have just been half-asleep when I wrote this solution