# Determine whether the series is convergent or divergent.

by Sabricd
Tags: alternating series, calc 2, series
 P: 28 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!
 P: 28 Nevermind! I figured out why. I guess I confused the alternating series test with some other one. :) Thanks!

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