Find the exact value of the expression cos-1-1

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter2: Analytic Trigonometry
Section2.4: Sum And Difference Formulas
Problem 1ECP: Find the exact value of cos12.
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Find the exact value of the expression cos-1-1

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