यदि $\frac{1}{x} + x = 2\cos \theta$ है,तो ${x^n} + \frac{1}{{{x^n}}}$ का मान ज्ञात कीजिए।

  • A
    $2\cos n\theta$
  • B
    $2\sin n\theta$
  • C
    $\cos n\theta$
  • D
    $\sin n\theta$

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