7. Let {a,} be the sequence defined by a, = n cos(n7) n+1 Do the following. (a) State the theorem that relates the convergence of a sequence to each of its subsequences. (b) Compute lim,n-x0 @2n- (c) compute lim, d2n–1- (d) Use subsequences to prove that {an} diverges. Be sure to state explicitly how the theorem in part (a) is applied.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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7. Let {a,} be the sequence defined by a,
n cos(n7)
n+1
Do the following.
(a) State the theorem that relates the convergence of a sequence to each of its
subsequences.
(b) Compute lim,n-x @2n-
(c) compute lim,,-0 a2n–1-
(d) Use subsequences to prove that {an} diverges. Be sure to state explicitly
how the theorem in part (a) is applied.
Transcribed Image Text:7. Let {a,} be the sequence defined by a, n cos(n7) n+1 Do the following. (a) State the theorem that relates the convergence of a sequence to each of its subsequences. (b) Compute lim,n-x @2n- (c) compute lim,,-0 a2n–1- (d) Use subsequences to prove that {an} diverges. Be sure to state explicitly how the theorem in part (a) is applied.
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