Please help me verify the identity: (1 - cos x)(1 + cos x) = 1/csc^2 x

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.1: Verifying Trigonometric Identities
Problem 20E
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Please help me verify the identity: (1 - cos x)(1 + cos x) = 1/csc^2 x
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