If $\sqrt{3} \cos \theta + \sin \theta = \sqrt{2}$,then the most general value of $\theta$ is

  • A
    $n\pi + (-1)^n \frac{\pi}{4}$
  • B
    $(-1)^n \frac{\pi}{4} - \frac{\pi}{3}$
  • C
    $n\pi + \frac{\pi}{4} - \frac{\pi}{3}$
  • D
    $n\pi + (-1)^n \frac{\pi}{4} - \frac{\pi}{3}$

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The number of solutions of $\tan x + \sec x = 2 \cos x$ in $[0, 2 \pi]$ are

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