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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