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

question 97

Multiple Choice

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

• A) \(\theta = \frac { \pi } { 2 } + 2 k \pi , \theta = \frac { 3 \pi } { 2 } + 2 k \pi\)
• 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) \(\theta = \frac { 3 \pi } { 2 } + \mathrm { k } \pi\)

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