The roots of the equation $1 - \cos \theta = \sin \theta .\sin \frac{\theta }{2}$ is

  • A

    $k\pi ,k \in I$

  • B

    $2k\pi ,k \in I$

  • C

    $k\frac{\pi }{2},k \in I$

  • D

    None of these

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  • [IIT 2011]

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