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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I’m having trouble solving this problem. Please help me.
![cos(195°)
=
5. Simplify the expression cos² (18°) - sin² (18°) to a single trig function of an angle.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9affadff-1dbc-4796-87cc-cd8c2c6f7c45%2Faa37d5b0-b3ab-40e3-9b68-a5ed5d287fda%2Fghvdumh_processed.jpeg&w=3840&q=75)
Transcribed Image Text:cos(195°)
=
5. Simplify the expression cos² (18°) - sin² (18°) to a single trig function of an angle.
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