यदि $x + \frac{1}{x} = 2\cos \theta$ है,तो $x$ का मान क्या होगा?

  • A
    $\cos \theta + i\sin \theta $
  • B
    $\cos \theta - i\sin \theta $
  • C
    $\cos \theta \pm i\sin \theta $
  • D
    $\sin \theta \pm i\cos \theta $

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