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Limits & Continuityhard
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Consider the function f(x)=∑n=1∞cos⁡(nx)enf(x) = \sum_{n=1}^{\infty} \frac{\cos(nx)}{e^n}f(x)=∑n=1∞​encos(nx)​. Which of the following is true regarding its continuity on R\mathbb{R}R?