Solve cos(2theta)=9sin(theta)-4 theta=?

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter1: The Six Trigonometric Functions
Section1.3: Definition I: Trigonometric Functions
Problem 22PS
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Solve

cos(2theta)=9sin(theta)-4

theta=?

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