$\cos \left(\tan^{-1} x\right) = . . . . . . . (|x| < 1)$.

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

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