Solve the Following Equation $\cos 2 x ( 4 \cos x + 2 ) = 0$

question 18

Multiple Choice

Solve the following equation.​ $\cos 2 x ( 4 \cos x + 2 ) = 0$ ​

• A) \(\frac { 4 \pi } { 3 } + n \pi , \frac { 2 \pi } { 3 } + n \pi , \frac { 4 \pi } { 3 } + 2 n \pi\)
• B)​ \(\frac { \pi } { 4 } + \frac { n \pi } { 2 } , \frac { 2 \pi } { 3 } + 2 n \pi , \frac { 4 \pi } { 3 } + 2 n \pi\)
• C)​ \(\frac { \pi } { 3 } + n \pi , \frac { \pi } { 3 } + n \pi\)
• D)​ \(\frac { \pi } { 2 } + n \pi , \frac { 2 \pi } { 5 } + n \pi\)
• E)​ \(\frac { 2 \pi } { 3 } + n \pi , \frac { 2 \pi } { 3 } + n \pi\)

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