Show that the series 00 f)-Σε -" cos n *x n=0 is infinitely differentiable everywhere, but the Taylor series about x = 0 f" (0) n! n=0 does not converge except for the origin.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Show that the series
00
fx)-Σ -" cos n'xi
n=0
is infinitely differentiable everywhere, but the Taylor series about x = 0
flM(0)
Σ
n!
n=0
does not converge except for the origin.
Transcribed Image Text:Show that the series 00 fx)-Σ -" cos n'xi n=0 is infinitely differentiable everywhere, but the Taylor series about x = 0 flM(0) Σ n! n=0 does not converge except for the origin.
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