यदि $\sqrt x + \frac{1}{{\sqrt x }} = 2\cos \theta$ है,तो ${x^6} + {x^{ - 6}} = $

  • A
    $2\cos 6\theta $
  • B
    $2 \cos 12\theta$
  • C
    $2\cos 3\theta $
  • D
    $2\sin 3\theta $

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