अवकलन ज्ञात कीजिए: $\frac{d}{dx} \tan^{-1} \left( \frac{ax - b}{bx + a} \right) = $

  • A
    $\frac{1}{1 + x^2}$
  • B
    $\frac{-1}{1 + x^2}$
  • C
    $\frac{a^2 + b^2}{1 + x^2}$
  • D
    इनमें से कोई नहीं

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