જો $y = \tan^2 \left( \cos^{-1} \sqrt{\frac{1+x^2}{2}} \right)$ હોય, તો $\frac{dy}{dx} = $

  • A
    $-\frac{4x}{(1-x^2)^2}$
  • B
    $\frac{4x}{(1+x^2)^2}$
  • C
    $-\frac{4x}{(1+x^2)^2}$
  • D
    $-\frac{4x}{1+x^2}$

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