Tìm nguyên hàm của hàm số \(f\left( x \right) = \sin 2x.\)
A. \(\int {f\left( x \right)dx} = \frac{1}{2}\cos 2x + C\)
B. \(\int {f\left( x \right)dx = - 2\cos 2x + C}\)
C. \(\int {f\left( x \right)dx} = \frac{{ - 1}}{2}\cos 2x + C\)
D. \(\int {f\left( x \right)dx} = 2\cos 2x + C\)
A. \(\int {f\left( x \right)dx} = \frac{1}{2}\cos 2x + C\)
B. \(\int {f\left( x \right)dx = - 2\cos 2x + C}\)
C. \(\int {f\left( x \right)dx} = \frac{{ - 1}}{2}\cos 2x + C\)
D. \(\int {f\left( x \right)dx} = 2\cos 2x + C\)