# Solving second degree trigonometric equations

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- Solve the following trigonometric equations:
- Determine a cosine equation that has the following general solution:

${\pi \over 2} + n\pi , { \pi \over 6} + 2n\pi, {{11\pi} \over 6} + 2n\pi,$ where $n$ is an integer

A) $\cos x (2\cos x + \sqrt2) = 0$

B) $\cos x (2 \cos x + \sqrt3) = 0$

C) $\cos x (2 \cos x - \sqrt2) = 0$

D) $\cos x (2 \cos x - \sqrt3) = 0$