If $\cos \theta + \cos 2\theta + \cos 3\theta = 0$, then the general value of $\theta $ is
If $\cos \theta + \cos 2\theta + \cos 3\theta = 0$, then the general value of $\theta $ is
- A
$\theta = 2m\pi \pm \frac{{2\pi }}{3}$
- B
$\theta = 2m\pi \pm \frac{\pi }{4}$
- C
$\theta = m\pi \pm {( - 1)^m}\frac{{2\pi }}{3}$
- D
$(a)$ and $(b)$ both
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