Find the Exact Solutions of the Given Equation in the Interval

question 19

Multiple Choice

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

• 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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