If cos 0= 3/5 and e in quadrant IV, find cos20 O -24/25 O -7/25 O 24/25 O 7/25
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 13E
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If cos θ= 3/5 and θ in quadrant IV, find cos2θ
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