यदि $y = \tan^{-1} \left\{ \frac{ax - b}{bx + a} \right\}$ है,तो $y' = $

  • A
    $\frac{1}{1 + x^2} + \frac{a^2}{a^2 + b^2}$
  • B
    $\frac{1}{1 + x^2}$
  • C
    $\frac{1}{1 + \left( \frac{ax - b}{bx + a} \right)^2}$
  • D
    $\frac{bx + a}{1 + (ax - b)^2}$

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