Show that 22 dz = 0 1 – cos(2) whenever y is a closed simple smooth curve contained in a very small disc around the origin but not passing through the origin.

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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Could you explain how to show this in detail?

Show that
22
dz = 0
1- cos(z)
COS
whenever y is a closed simple smooth curve contained in a very small disc around the origin
but not passing through the origin.
Transcribed Image Text:Show that 22 dz = 0 1- cos(z) COS whenever y is a closed simple smooth curve contained in a very small disc around the origin but not passing through the origin.
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