$\cot \theta = \sin 2\theta (\theta \ne n\pi $, $n$ is integer), if $\theta = $

  • A

    ${45^o}$ and ${60^o}$

  • B

    ${45^o}$ and ${90^o}$

  • C

    ${45^o}$only

  • D

    ${90^o}$only

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