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Direct comparison test
Timed Test
We know that $\displaystyle 0\le\dfrac{|\cos(n)|}{n}\le \dfrac{1}{n}$ for any $n\ge 1$. **Considering this fact, what does the direct comparison test say about $\displaystyle\sum\limits_{n=1}^{\infty }\dfrac{|\cos(n)|}{n}$ ?** [[☃ radio 3]]
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