Determine whether the series is convergent or divergent.

by Sabricd
Tags: alternating series, calc 2, series
 P: 27 Hello, I have to determine whether the series converges or diverges. It is $$\Sigma$$ (-1)^n * cos(Pi/n) where n=1 and goes to infinity. First I took the absolute value of the function and got the limit from n to infinity of cos(pi/n) and as a result I got 1 because cos(0)=1. However my text book says it's divergent. Could you please help me understand why it is divergent? Thank you!