convergence of trigonometric series

tessec

New member
Joined
Sep 21, 2006
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4
Hey all.. I'm seriously confused about the behavior of trig functions in a series. How do I know if they converge or diverge?

for example: convergence or divergence?

the sum of (sigma)

(3+ cos(n))/(3^n)

from n=0 to infinity

i think i have to use the comparison theorem (just because thats what unit we're on..), but i'm really stuck. help would be much appreciated! thanks!
 
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