trigonometry

Question: The solution of the equation $\begin{vmatrix} {\cos \theta } & {\sin \theta }&{\cos \theta }\\ { - \sin \theta }&{\cos \theta }&{\sin \theta }\\ { - \cos \theta }&{ - \sin \theta }&{\cos \theta } \end{vmatrix} = 0$ , is

1) $\theta =n\pi $

2) $\theta =2n\pi \pm \frac{\pi }{2}$

3) $\theta =n\pi \pm {{(-1)}^{n}}\frac{\pi }{4}$

4) $\theta =2n\pi \pm \frac{\pi }{4}$

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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