The value of $\int {\frac{{2dx}}{{\sqrt {1 - 4{x^2}} }}} $ is

  • A
    $\tan^{-1}(2x) + c$
  • B
    $\cot^{-1}(2x) + c$
  • C
    $\cos^{-1}(2x) + c$
  • D
    $\sin^{-1}(2x) + c$

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