Suppose that f(z) = [1 − cos (z)]/[z*(z^4-1)*(z^2+9)^2] Find all isolated singular points of f(z), and classify them into the three types (removable, pole, or essential). For the poles, determine the orders.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.2: Graphs Of Equations
Problem 78E
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Suppose that
f(z) = [1 − cos (z)]/[z*(z^4-1)*(z^2+9)^2]
Find all isolated singular points of f(z), and classify them into the three types (removable, pole, or essential). For the poles, determine the orders.

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