If $sin\, \theta = sin\, \alpha$ then $sin\, \frac{\theta }{3}$ =

  • A

    $sin\, \frac{\alpha }{3}$

  • B

    $sin \, \left( {\frac{\pi }{3} - \frac{\alpha }{3}} \right)$

  • C

    $- sin \, \left( {\frac{\pi }{3} + \frac{\alpha }{3}} \right)$

  • D

    All of the above

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