If $\sin \theta - \cos \theta = \frac{1}{\sqrt{3}}$,then $\sin(2\theta) + \cos(4\theta) + \sin(6\theta) = $

  • A
    $\frac{37}{27}$
  • B
    $\frac{-37}{27}$
  • C
    $\frac{-43}{27}$
  • D
    $\frac{43}{27}$

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