यदि $f(x) = x \tan^{-1} x$ है,तो $f'(1) =$

  • A
    $1 + \frac{\pi}{4}$
  • B
    $\frac{1}{2} + \frac{\pi}{4}$
  • C
    $\frac{1}{2} - \frac{\pi}{4}$
  • D
    $2$

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