I want to know how to use a simple method to prove $\sum\frac{\sin(n)sin(n^2)}{n}$ is absolutely convergent?
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Try to show your attempt. – user264745 Oct 17 '22 at 13:56
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I can only prove it's convergent – lynor Oct 17 '22 at 14:27
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@lynor How? Show us. – Bob Dobbs Oct 17 '22 at 14:54