If $\cos 2\theta + 3\cos \theta = 0$, then the general value of $\theta $ is
If $\cos 2\theta + 3\cos \theta = 0$, then the general value of $\theta $ is
- A
$2n\pi \pm {\cos ^{ - 1}}\frac{{ - 3 + \sqrt {17} }}{4}$
- B
$2n\pi \pm {\cos ^{ - 1}}\frac{{ - 3 - \sqrt {17} }}{4}$
- C
$n\pi \pm {\cos ^{ - 1}}\frac{{ - 3 + \sqrt {17} }}{4}$
- D
$n\pi \pm {\cos ^{ - 1}}\frac{{ - 3 - \sqrt {17} }}{4}$
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Let $S=\{x \in R: \cos (x)+\cos (\sqrt{2} x)<2\}$, then
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- [KVPY 2018]
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