व्यंजक $ \tan \left(\frac{1}{2} \cos ^{-1} \frac{2}{\sqrt{5}}\right) $ का मान है

  • A
    $ 12-\sqrt{5} $
  • B
    $ \sqrt{5}-2 $
  • C
    $ \frac{\sqrt{5}-2}{2} $
  • D
    $ 5-\sqrt{2} $

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