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Câu hỏi: Cho $f\left( x \right)=\sin 2x$, mệnh đề nào dưới đây đúng?
A. $\int{f\left( x \right)\text{d}x}=2\cos 2x+C$.
B. $\int{f\left( x \right)\text{d}x}=-2\cos 2x+C$.
C. $\int{f\left( x \right)\text{d}x}=\dfrac{1}{2}\cos 2x+C$.
D. $\int{f\left( x \right)\text{d}x}=-\dfrac{1}{2}\cos 2x+C$.
A. $\int{f\left( x \right)\text{d}x}=2\cos 2x+C$.
B. $\int{f\left( x \right)\text{d}x}=-2\cos 2x+C$.
C. $\int{f\left( x \right)\text{d}x}=\dfrac{1}{2}\cos 2x+C$.
D. $\int{f\left( x \right)\text{d}x}=-\dfrac{1}{2}\cos 2x+C$.
Đáp án D.