trigonometry

Question: If $\cos 2\theta +3\cos \theta =0$, then the general value of $\theta $ is

1) $2n\pi \pm {{\cos }^{-1}}\frac{-3+\sqrt{17}}{4}$

2) $2n\pi \pm {{\cos }^{-1}}\frac{-3-\sqrt{17}}{4}$

3) $n\pi \pm {{\cos }^{-1}}\frac{-3+\sqrt{17}}{4}$

4) $n\pi \pm {{\cos }^{-1}}\frac{-3-\sqrt{17}}{4}$

Solution:

Explanation: No Explanation

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