If 90∘<θ<180∘ and sinθ=2/7, find cos2θ.
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter3: Functions And Graphs
Section3.7: Operations On Functions
Problem 40E
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If 90∘<θ<180∘ and sinθ=2/7, find cos2θ.
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