SOLUTION: How can we show if the sequence αn = 2cos(nπ) is monotone or not?

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Question 563150: How can we show if the sequence αn = 2cos(nπ) is monotone or not?
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
2 cos (n*pi) is not monotonic. Monotonic means that the function is either strictly increasing or strictly decreasing.