Show that the Maclaurin series of e² cos z can be written as 2n/2 n! n=0 COS (17) ²

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Question

Please find the maclaurin series of (e^z)(cosz) and prove that it is equal to the answer in the picture.

This is from class complex variables. 

The other picture attached shows a similar question as an example.  

Show that the Maclaurin series of e² cos z can be written as
2n/2
n!
n=0
COS
(17) ²
2n
Transcribed Image Text:Show that the Maclaurin series of e² cos z can be written as 2n/2 n! n=0 COS (17) ² 2n
f(z) = e²³sinz
e²
1)
= e
لم د
- e-iz
eiz
= /[²(t-1)]
〃
(t-i) z
e
||
ondo
2 č
e
2 : ( 2 (0+1)/2] _ { [(1-1)2]^") for all 2
[(1+i)z]^
2i
=]
não
n!
n=o
(1+i)^- (1-i)^
16420
(2i)n! z^
For all z
Transcribed Image Text:f(z) = e²³sinz e² 1) = e لم د - e-iz eiz = /[²(t-1)] 〃 (t-i) z e || ondo 2 č e 2 : ( 2 (0+1)/2] _ { [(1-1)2]^") for all 2 [(1+i)z]^ 2i =] não n! n=o (1+i)^- (1-i)^ 16420 (2i)n! z^ For all z
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