6. Let a be a real number. Consider the series Σ cos(n7) An, where An = 2n + 1 n=0 (a) Is it possible to find an a > 0 such that the above series is both absolutely convergent and conditionally convergent? Briefly explain your reasoning. Answers without reasoning will be given 0. (b) Find all a > 0 such that the series diverges. (c) Find all a > 0 such that the series converges absolutely. (d) Find all a > 0 such that the series converges conditionally.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.3: Geometric Sequences
Problem 82E
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6. Let a be a real number. Consider the series
Σ
an
cos(nT);
An,
where
An =
2n + 1"
n=0
(a) Is it possible to find an > 0 such that the above series is both absolutely convergent
and conditionally convergent? Briefly explain your reasoning.
Answers without reasoning will be given 0.
(b) Find all > 0 such that the series diverges.
(c) Find all a > 0 such that the series converges absolutely.
(d) Find all a > 0 such that the series converges conditionally.
Transcribed Image Text:6. Let a be a real number. Consider the series Σ an cos(nT); An, where An = 2n + 1" n=0 (a) Is it possible to find an > 0 such that the above series is both absolutely convergent and conditionally convergent? Briefly explain your reasoning. Answers without reasoning will be given 0. (b) Find all > 0 such that the series diverges. (c) Find all a > 0 such that the series converges absolutely. (d) Find all a > 0 such that the series converges conditionally.
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