Find cos 2a if 4 sin a - COS a = 3. 2 sin a + COS a

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 50E
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Question
Find cos 2a if
4 sin a
-
COS a
= 3.
2 sin
a
+
COS a
Transcribed Image Text:Find cos 2a if 4 sin a - COS a = 3. 2 sin a + COS a
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