If $\cos A\sin \left( {A - \frac{\pi }{6}} \right)$ is maximum, then the value of $A$ is equal to

  • A

    $\frac{\pi }{3}$

  • B

    $\frac{\pi }{4}$

  • C

    $\frac{\pi }{2}$

  • D

    None of these

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