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Solve the Equation for Exact Solutions Over the Interval [0 [0,2π)[ 0,2 \pi )

Question 384

Multiple Choice

Solve the equation for exact solutions over the interval [0, 2 [0,2π) [ 0,2 \pi )
- cos⁡2x+2cos⁡x+1=0\cos ^ { 2 } x + 2 \cos x + 1 = 0


A) {π4,7π4}\left\{ \frac { \pi } { 4 } , \frac { 7 \pi } { 4 } \right\}
B) {π}\{ \pi \}
C) {2π}\{ 2 \pi \}
D) {π2,3π2}\left\{ \frac { \pi } { 2 } , \frac { 3 \pi } { 2 } \right\}

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