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Limits & Continuityhard
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Let f(x)=∑n=1∞sin⁡(nx)n2f(x) = \sum_{n=1}^{\infty} \frac{\sin(nx)}{n^2}f(x)=∑n=1∞​n2sin(nx)​. Which of the following describes the continuity and differentiability of f(x)f(x)f(x) on R\mathbb{R}R?