show that f(z)=(z-1) cos(1/z+2) has an essential singularity at z=-2

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter9: Multivariable Calculus
Section9.2: Partial Derivatives
Problem 36E
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show that f(z)=(z-1) cos(1/z+2) has an essential singularity at z=-2 

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