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Question Number 33586 by abdo imad last updated on 19/Apr/18

find Σ_(n=1) ^∞ z^n ((sin(nθ))/n) with z from C and ∣z∣<1 .

$${find}\:\:\sum_{{n}=\mathrm{1}} ^{\infty} \:{z}^{{n}} \:\:\frac{{sin}\left({n}\theta\right)}{{n}}\:\:{with}\:{z}\:{from}\:{C}\:{and}\:\mid{z}\mid<\mathrm{1}\:. \\ $$

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