Use Trigonometric identities to show that cos(2θ) + 2 sin2 (θ) = 1

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 16E
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Use Trigonometric identities to show that cos(2θ) + 2 sin(θ) = 1

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