यदि $x + \frac{1}{x} = 2\cos \theta ,$ है,तो ${x^3} + \frac{1}{{{x^3}}} = $

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

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