Find All Solutions in the Interval [0, 2π]
- $$\cos ^ { 2 } x + 2 \cos x + 1 = 0$$

question 237

Multiple Choice

Find all solutions in the interval [0, 2π]
- $$\cos ^ { 2 } x + 2 \cos x + 1 = 0$$

• A) \(x = \frac { \pi } { 2 } , \frac { 3 \pi } { 2 }\)
• B) \(x = 2 \pi\)
• C) \(x = \pi\)
• D) \(x = \frac { \pi } { 4 } , \frac { 7 \pi } { 4 }\)

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