5. Simplify the expression cos² (18°) - sin² (18°) to a single trig function of an angle
5. Simplify the expression cos² (18°) - sin² (18°) to a single trig function of an angle
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 15E
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