Prove each identity    cos 4 A- sin 4 A = cos 2A

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter6: Equations
Section6.3: Trigonometric Equations Involving Multiple Angles
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Prove each identity 

 

cos 4 A- sin 4 A = cos 2A

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