For each of the following equations, solve for (a) all degree solutions and (b) u if0° <= u , 360°. Do not use a calculator.     2 cos2 u + 11 cos u =-5

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter6: Equations
Section6.3: Trigonometric Equations Involving Multiple Angles
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For each of the following equations, solve for (a) all degree solutions and (b) u if
0° <= u , 360°. Do not use a calculator.

 

  2 cos2 u + 11 cos u =-5

Expert Solution
Step 1

Given: 2cos2u+11cosu=-5

for solving this equation we use factorization method

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