જો $y = \cot^{-1} \left( \frac{1 + x}{1 - x} \right)$ હોય,તો $\frac{dy}{dx} = $

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

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સમીકરણ $\sin \left[ \cot^{-1} (1 + x) \right] = \cos \left[ \tan^{-1} x \right]$ નું સમાધાન કરતું $x$ નું મૂલ્ય શોધો.

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