20.6. Find the (unique) Laurent expansion of each of the following functions in each of its regions of analyticity: 1 (b) z cos(2²). (z − 2)(z-3)* 1 (1 − z)³ ˚ Z (a) (e) (i) 2 1 (f) 1 22 z² - 1 (c) (g) 1 2² (1-z) 2²-4 22-9 (d) (h) sinh z 2 1 (z² — 1)² *

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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The question is about complex series.

( z ) is a complex number.

Please solve parts d, e and f.

20.6. Find the (unique) Laurent expansion of each of the following functions
in each of its regions of analyticity:
sinh z – z
(d)
1
1
(a)
(z – 2)(z – 3)*
(b) z cos(22).
(c)
22(1
24
22 – 4
1
(e)
(1 – z)3*
1
1
(f)
z² – 1°
(g)
22 – 9*
(h)
(2² – 1)2 °
(i)
–
- Z
Transcribed Image Text:20.6. Find the (unique) Laurent expansion of each of the following functions in each of its regions of analyticity: sinh z – z (d) 1 1 (a) (z – 2)(z – 3)* (b) z cos(22). (c) 22(1 24 22 – 4 1 (e) (1 – z)3* 1 1 (f) z² – 1° (g) 22 – 9* (h) (2² – 1)2 ° (i) – - Z
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