$\tan (\cos ^{ - 1}x)$ का मान किसके बराबर है?

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

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