જો $\cos \theta = \frac{1}{2}\left( x + \frac{1}{x} \right)$ હોય,તો $\frac{1}{2}\left( x^2 + \frac{1}{x^2} \right) = $

  • A
    $\sin 2\theta $
  • B
    $\cos 2\theta $
  • C
    $\tan 2\theta $
  • D
    $\sec 2\theta $

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જો $\theta = \frac{\pi}{9}$ હોય,તો $1 + 27 \tan^2 \theta - 33 \tan^4 \theta + \tan^6 \theta = $

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