级数2题

楼主: min102257 (暱称)   2013-06-21 20:28:47
抱歉 请指点迷津
(1) if ΣAn (An > 0) is convergent,
then Σsin(An) is conv. or div. ?
(2) if ΣAn is convergent,
then Σsin(An) is conv. or div. ?

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