यदि $y = \sqrt{\tan x + \sqrt{\tan x + \sqrt{\tan x + \dots \infty}}}$, तो $x = \frac{\pi}{4}$ पर $(\frac{dy}{dx})^2$ का मान है

  • A
    $\frac{5}{4}$
  • B
    $\frac{-5}{4}$
  • C
    $\frac{4}{5}$
  • D
    $\frac{-4}{5}$

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