prove the following identity (1-tan2(x))/(1+tan2(x))=2cos2(x)-1

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 83E
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prove the following identity (1-tan2(x))/(1+tan2(x))=2cos2(x)-1

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