જો $0 < x < 1$ હોય,તો $\sqrt{1 + x^2} [\{x \cos (\cot^{-1} x) + \sin (\cot^{-1} x)\} ^2 - 1]^{\frac{1}{2}} =$ શું થાય?

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

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