trigonometry

Question: If $\sin \theta +\cos \theta =\sqrt{2}\cos \alpha $, then the general value of $\theta $ is

1) $2n\pi -\frac{\pi }{4}\pm \,\,\alpha $

2) $2n\pi +\frac{\pi }{4}\pm \alpha $

3) $n\pi -\frac{\pi }{4}\pm \alpha $

4) $n\pi +\frac{\pi }{4}\pm \alpha $

Solution:

Explanation: No Explanation

Solution of trigonometric equations

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