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Consider the sequence \((u_n)\) defined for all \(n \in \mathbb{N}\) by \(u_n = \cos(n)\). Which statement is true?
The sequence is bounded between \(-1\) and \(1\).
The sequence is not bounded because it oscillates.
The sequence is only upper bounded by \(1\).
The sequence is only lower bounded by \(-1\).
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