The most general value of $\theta $ satisfying the equations $\sin \theta = \sin \alpha $ and $\cos \theta = \cos \alpha $ is

  • [IIT 1971]
  • A

    $2n\pi + \alpha $

  • B

    $2n\pi - \alpha $

  • C

    $n\pi + \alpha $

  • D

    $n\pi - \alpha $

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