Find the Exact Solutions of the Given Equation in the Interval

question 62

Multiple Choice

Find the exact solutions of the given equation in the interval [0, 2 $\pi$ ) . $\cos 2 x + 3 \cos x + 2 = 0$

• A) \(x = 0 , \pi , \frac { 2 \pi } { 3 } , \frac { 5 \pi } { 3 }\)
• B) \(x = \pi , \frac { \pi } { 3 } , \frac { 5 \pi } { 3 }\)
• C) \(x = \pi , \frac { 2 \pi } { 3 } , \frac { 4 \pi } { 3 }\)
• D) x = 0
• E) \(x = 0 , \pi , \frac { \pi } { 3 } , \frac { 4 \pi } { 3 }\)

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