If $\sin \theta + \cos \theta = \sqrt 2 \cos \alpha $, then the general value of $\theta $ is
If $\sin \theta + \cos \theta = \sqrt 2 \cos \alpha $, then the general value of $\theta $ is
- A
$2n\pi - \frac{\pi }{4} \pm \,\,\alpha $
- B
$2n\pi + \frac{\pi }{4} \pm \alpha $
- C
$n\pi - \frac{\pi }{4} \pm \alpha $
- D
$n\pi + \frac{\pi }{4} \pm \alpha $
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