Solve the Equation for Exact Solutions Over the Interval [0 $$\cos ^ { 2 } x + 2 \cos x + 1 = 0$$

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

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

Correct Answer:

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