If $\cos 7\theta = \cos \theta - \sin 4\theta $, then the general value of $\theta $ is
If $\cos 7\theta = \cos \theta - \sin 4\theta $, then the general value of $\theta $ is
- A
$\frac{{n\pi }}{4},\frac{{n\pi }}{3} + \frac{\pi }{{18}}$
- B
$\frac{{n\pi }}{3},\frac{{n\pi }}{3} + {( - 1)^n}\frac{\pi }{{18}}$
- C
$\frac{{n\pi }}{4},\frac{{n\pi }}{3} + {( - 1)^n}\frac{\pi }{{18}}$
- D
$\frac{{n\pi }}{6},\frac{{n\pi }}{3} + {( - 1)^n}\frac{\pi }{{18}}$
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