A série \sum \frac{a_n \sin(\frac{3n^2+6}{n^4+1})}{1+|a_n|} é absolutamente convergente (se a_n for limitada)
A série \sum \frac{a_n \sin(\frac{3n^2+6}{n^4+1})}{1+|a_n|} é absolutamente convergente (se a_n for limitada)
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