Solve the Equation (X in Radians and θ in Degrees) $$\cos ^ { 2 } x + 2 \cos x = - 1$$

question 2

Multiple Choice

Solve the equation (x in radians and θ in degrees) for all exact solutions where appropriate. Round approximate answers in radians to four decimal places and approximate answers in degrees to the nearest tenth.
- $$\cos ^ { 2 } x + 2 \cos x = - 1$$

• A) \(\{ \mathrm { n } \pi \}\)
• B) \(\{ \pi + 2 n \pi \}\)
• C) \(\{ 2 n \pi \}\)
• D) \(\left\{ \frac { \pi } { 2 } + n \pi , 2 n \pi \right\}\)

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