\(\int\limits_0^{\frac{\pi }{2}} {\dfrac{{\sin 2x}}{{\sqrt {{{\cos }^2}x + 4{{\sin }^2}x} }}} \) bằng:
A.\(\dfrac{3}{2}\)
B.\(\dfrac{3}{4}\)
C.\(\dfrac{2}{3}\)
D.\(\dfrac{2}{5}\)

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