(cos^4 x) - (sin^4 x) = cos2x   verify the identity

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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(cos^4 x) - (sin^4 x) = cos2x

 

verify the identity

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