If Σ_(n=0) ^∞ ((cosnsin(na))/n) is converge then a is? 1. a∈Z 2. a∈{kπ:k∈Z} 3. a∈R−{((2k+1)/2)π:k∈Z} 4. a∈R


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Question Number 53619 by kaivan.ahmadi last updated on 23/Jan/19
$If Σ_(n=0) ^∞ ((cosnsin(na))/n) is converge then a is? 1. a∈Z 2. a∈{kπ:k∈Z} 3. a∈R−{((2k+1)/2)π:k∈Z} 4. a∈R$
$If \underset{n = 0}{\sum^{\infty}} \frac{cosnsin (na)}{n} is converge then a is ?$ $1 . a \in Z$ $2 . a \in {k π : k \in Z}$ $3 . a \in R - {\frac{2 k + 1}{2} π : k \in Z}$ $4 . a \in R$
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