題組內容
6. (6%) Determine whether the sequence converges or diverges. If it converges, find the limit.
(b) \( (3\%) \) \( a_{n} = \frac{\cos^{2}n}{2^{n}} \)
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6. (6%) Determine whether the sequence converges or diverges. If it converges, find the limit.
(b) \( (3\%) \) \( a_{n} = \frac{\cos^{2}n}{2^{n}} \)