यदि $x \geq 1$ है,तो $2 \tan^{-1} x + \sin^{-1} (\frac{2x}{1+x^2})$ का मान क्या होगा?

  • A
    $4 \tan^{-1} x$
  • B
    $0$
  • C
    $\frac{2 \pi}{3}$
  • D
    $\pi$

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