If $\cot \theta = \sin 2\theta$ (where $\theta \neq n\pi$,$n$ is an integer),then $\theta$ is equal to:

  • A
    $45^o$ and $60^o$
  • B
    $45^o$ and $90^o$
  • C
    $45^o$ only
  • D
    $90^o$ only

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