Simplify each of the following.   2 cos2 105 degree - 1

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter5: Identities And Formulas
Section5.3: Double-angle Formulas
Problem 38PS
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Simplify each of the following.

 

2 cos2 105 degree - 1

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