Lindsay solved the equation sin x = 1 - cos x by squaring each side to obtain sin2 x = 1 - 2 cos x + cos2 x. Several steps later, using correct algebra, she concluded that the solution set for solu- tions over the interval 30, 2p2 is E 0, p 2 , 3p 2 F. Explain why this is not correct.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 62E
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Lindsay solved the equation sin x = 1 - cos x by squaring each
side to obtain

sin2 x = 1 - 2 cos x + cos2 x.

Several steps later, using correct algebra, she concluded that the solution set for solu-
tions over the interval 30, 2p2 is E 0, p

2 ,
3p
2 F. Explain why this is not correct.

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