$-1 < x < 1$ के लिए,यदि $f(x) = \cos^2 \left( \tan^{-1} \sqrt{\frac{1-x}{1+x}} \right)$ है,तो $f'(x) =$

  • A
    $\frac{1}{2}$
  • B
    $1$
  • C
    $-1$
  • D
    $-\frac{1}{2}$

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