Solve with the methods shown in this section exactly on the interval [0, 2x). (Enter your answers as a comma-separated list.) 9 cos(20) = 9 cos²(0) – 4

Algebra & Trigonometry with Analytic Geometry
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ISBN:9781133382119
Author:Swokowski
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Chapter7: Analytic Trigonometry
Section: Chapter Questions
Problem 35RE
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please help, answer in radians 

Solve with the methods shown in this section exactly on the interval [0, 21). (Enter your answers as a comma-separated list.)
9 cos(20) = 9 cos2(0) – 4
=
Transcribed Image Text:Solve with the methods shown in this section exactly on the interval [0, 21). (Enter your answers as a comma-separated list.) 9 cos(20) = 9 cos2(0) – 4 =
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