If $\tan \theta \cdot \cos 60^{\circ} = \frac{\sqrt{3}}{2}$,then the value of $\sin (\theta - 15^{\circ})$ is

  • A
    $\frac{\sqrt{3}}{2}$
  • B
    $\frac{1}{2}$
  • C
    $1$
  • D
    $\frac{1}{\sqrt{2}}$

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