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

  • A
    $x^3 - \frac{1}{x^3}$
  • B
    $\left(x + \frac{1}{x}\right)^3$
  • C
    $x + \frac{1}{x}$
  • D
    $x^3 + \frac{1}{x^3}$

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