Solve the Equation $2 \cos \theta + 1 = 0$ A) $\theta = \frac { \pi } { 2 } + 2 \mathrm { k } \pi , \theta = \frac { 3 \pi } { 2 } + 2 \mathrm { k } \pi$

Multiple Choice

Solve the equation. Give a general formula for all the solutions.
- $2 \cos \theta + 1 = 0$

A) $\theta = \frac { \pi } { 2 } + 2 \mathrm { k } \pi , \theta = \frac { 3 \pi } { 2 } + 2 \mathrm { k } \pi$
B) $\theta = \frac { 2 \pi } { 3 } + 2 \mathrm { k } \pi , \theta = \frac { 4 \pi } { 3 } + 2 \mathrm { k } \pi$
C) $\theta = \frac { 2 \pi } { 3 } + \mathrm { k } \pi , \theta = \frac { 4 \pi } { 3 } + \mathrm { k } \pi$
D) $\theta = \frac { 3 \pi } { 2 } + \mathrm { k } \pi$