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

  • A
    $0$
  • B
    $1$
  • C
    $\frac{1}{4}$
  • D
    $2$

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