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December 5th, 2016, 03:57 PM   #1
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Question Upper and lower bound of A1 and A2 ( please help me out)

Find upper bound and lower bound of :
A1=2(-1)^n+1 + [(-1)^(n(n+1)/2) * (2+3/n)]. n∈N∗ ,
A2=(n+1)/(n+2) * cos(n*2pi/3). n∈N∗ ,
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December 5th, 2016, 07:00 PM   #2
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For A2, consider (n + 1)/(n + 2) and cos(n*2pi/3) separately. What progress can you make by doing that?
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December 19th, 2016, 04:35 PM   #3
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In A1, is that ((-1)^n)+ 1 or did you intend (-1)^(n+1)?

Also are you only asking for "upper bounds" and "lower bounds" or "least upper bounds" and "greatest lower bounds"?
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