Is ∞Σ(n=1) (−1)^n sin(n) an alternating series? Explain?
回答 (1)
2016-03-30 12:52 am
✔ 最佳答案
No. To be an alternating series, the general term is of the form "(-1)^n times a (strictly) positive a_n", or "(-1)^(n+1) times a_n" so it alternates in signs from term to terms. In this case, sin(n) is not always positive or negative so terms (-1)sin(n) do not alternate in signs.
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