Can someone help me evaluate$sum_{n=0}^{infty} {r^n sin ntheta}$ if $r=0.5$ and $theta = pi/3$?












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Can someone help me evaluate $sum_{n=0}^{infty} {r^n sin ntheta}$ if $r=0.5$ and $theta = pi/3$?  This never looks like a pattern. Can someone help?










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  • 6




    $begingroup$
    This is $Imsum_{n=0}^{infty}big(re^{itheta}big)^n$ with the sum of a geometric series.
    $endgroup$
    – metamorphy
    Dec 30 '18 at 10:28










  • $begingroup$
    math.stackexchange.com/questions/364631/…
    $endgroup$
    – lab bhattacharjee
    Dec 30 '18 at 11:28
















0












$begingroup$


Can someone help me evaluate $sum_{n=0}^{infty} {r^n sin ntheta}$ if $r=0.5$ and $theta = pi/3$?  This never looks like a pattern. Can someone help?










share|cite|improve this question











$endgroup$








  • 6




    $begingroup$
    This is $Imsum_{n=0}^{infty}big(re^{itheta}big)^n$ with the sum of a geometric series.
    $endgroup$
    – metamorphy
    Dec 30 '18 at 10:28










  • $begingroup$
    math.stackexchange.com/questions/364631/…
    $endgroup$
    – lab bhattacharjee
    Dec 30 '18 at 11:28














0












0








0





$begingroup$


Can someone help me evaluate $sum_{n=0}^{infty} {r^n sin ntheta}$ if $r=0.5$ and $theta = pi/3$?  This never looks like a pattern. Can someone help?










share|cite|improve this question











$endgroup$




Can someone help me evaluate $sum_{n=0}^{infty} {r^n sin ntheta}$ if $r=0.5$ and $theta = pi/3$?  This never looks like a pattern. Can someone help?







sequences-and-series






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share|cite|improve this question













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edited Dec 30 '18 at 10:26









metamorphy

3,8971721




3,8971721










asked Dec 30 '18 at 10:21









user187604user187604

289111




289111








  • 6




    $begingroup$
    This is $Imsum_{n=0}^{infty}big(re^{itheta}big)^n$ with the sum of a geometric series.
    $endgroup$
    – metamorphy
    Dec 30 '18 at 10:28










  • $begingroup$
    math.stackexchange.com/questions/364631/…
    $endgroup$
    – lab bhattacharjee
    Dec 30 '18 at 11:28














  • 6




    $begingroup$
    This is $Imsum_{n=0}^{infty}big(re^{itheta}big)^n$ with the sum of a geometric series.
    $endgroup$
    – metamorphy
    Dec 30 '18 at 10:28










  • $begingroup$
    math.stackexchange.com/questions/364631/…
    $endgroup$
    – lab bhattacharjee
    Dec 30 '18 at 11:28








6




6




$begingroup$
This is $Imsum_{n=0}^{infty}big(re^{itheta}big)^n$ with the sum of a geometric series.
$endgroup$
– metamorphy
Dec 30 '18 at 10:28




$begingroup$
This is $Imsum_{n=0}^{infty}big(re^{itheta}big)^n$ with the sum of a geometric series.
$endgroup$
– metamorphy
Dec 30 '18 at 10:28












$begingroup$
math.stackexchange.com/questions/364631/…
$endgroup$
– lab bhattacharjee
Dec 30 '18 at 11:28




$begingroup$
math.stackexchange.com/questions/364631/…
$endgroup$
– lab bhattacharjee
Dec 30 '18 at 11:28










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