I've got a few problems here I'm wanting some guidance over.
1.
Am I right in thinking the Ratio test is the one to use here?
I get
Do I use the Ratio Test again? I end up with
2.
Absolute convergence test?
|cos n|<1, thus the above series can be reduced down to
>>edit: sorry, made a mistake in the original post in the series equation. Now rectified.<<
3.
I'm thinking the Root test here?
then, since , we're left with just
Any/all of these on the right track or have I totally lost the plot here?
Cheers!