$\sin [\cot ^{ - 1}(\cos \tan ^{ - 1}x)] =$

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

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