Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Question
Please help me solve the given trigonometric equation.
![cos(4x)-3cos(2x)-4 for xe [0.2π]](https://content.bartleby.com/qna-images/question/b9f41a83-9e41-4cec-b773-8e61bc09ff04/c84640c0-048f-41cf-b941-4ecd9762991a/vz4s7tj.png)
Transcribed Image Text:cos(4x)-3cos(2x)-4 for xe [0.2π]
Expert Solution
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Step 1
Consider the given equation and replace the term cos(4x) using double angle trigonometric identity. We use, cos(4x) = 2cos2(2 x) – 1. This will help us have the entire equation in the form of cos(2x). We get:
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Step 2
We now have a quadratic equation in terms of cos(2x). Hence, we can first solve for cos(2 x), by solving the equation using factoring.
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Step 3
Solving further we get:
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