00 (log r)4 1+x2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.4: Logarithmic Functions
Problem 28E
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Solve using contour integration.  Make the branch cut to include only the pole at z=i in the region.

(log z)4
0
-dx
1+x²
+r²
Transcribed Image Text:(log z)4 0 -dx 1+x² +r²
Expert Solution
Solution:

Let fz=log z41+z2

By residue theoremC1+CRfzdz=2πiResidues of f inside the contour.

However, CRfzdz=0 as fz<Mz2  where M>0.

limRC1fzdz=limR-RRfzdz=-fxdx=I.

The poles are z=i and z=-i in which only z = i lies within the contour.

 

 

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