જો $\int (\cos x - \sin x) \, dx = \sqrt{2} \sin (x + \alpha) + c$ હોય,તો $\alpha = $

  • A
    $\frac{\pi}{3}$
  • B
    $-\frac{\pi}{3}$
  • C
    $\frac{\pi}{4}$
  • D
    $-\frac{\pi}{4}$

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