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how do you find the sum of the series sigma n=0 ; 4 (cosn*pi) (3/4)^n
 one year ago
 one year ago
how do you find the sum of the series sigma n=0 ; 4 (cosn*pi) (3/4)^n
 one year ago
 one year ago

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snickerzzzBest ResponseYou've already chosen the best response.0
\[\sum_{n=0}^{\infty} 4 (\cos n \pi) (\frac{ 3 }{ 4 })^{n}\]
 one year ago

RONNCCBest ResponseYou've already chosen the best response.0
are you sure it is till infinity?
 one year ago

TuringTestBest ResponseYou've already chosen the best response.0
Perhaps you can use some trig identities in conjunction with the ratio test.
 one year ago
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