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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