- #1
Sabricd
- 27
- 0
Hello,
I have to determine whether the series converges or diverges.
It is [tex]\Sigma[/tex] (-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 textbook says it's divergent. Could you please help me understand why it is divergent?
Thank you!
I have to determine whether the series converges or diverges.
It is [tex]\Sigma[/tex] (-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 textbook says it's divergent. Could you please help me understand why it is divergent?
Thank you!