Find $\frac{d}{dx}[arcsin(2x)]$

$\frac{-2}{\sqrt[\phantom{2}]{1+4x^2}}$

$\frac{2}{\sqrt[\phantom{2}]{1-4x^2}}$

$\frac{1}{\sqrt[\phantom{2}]{1-2x^2}}$

$\frac{1}{2\sqrt[\phantom{2}]{1-4x^2}}$