Solve the Equation (X in Radians And $$\boldsymbol { \theta }$$

Multiple Choice

Solve the equation (x in radians and $$\boldsymbol { \theta }$$ 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.
- $$\cos ^ { 2 } x - \cos x = 0$$

A) $\left\{ 2 n \pi , \frac { \pi } { 2 } + n \pi \right\}$
B) $\left\{ \frac { 5 \pi } { 3 } + 2 n \pi \right\}$
C) $\left\{ \frac { \pi } { 2 } + 2 n \pi \right\}$
D) $\{ \pi + 2 n \pi \}$