Google
Câu hỏi: Cho hàm số $f\left( x \right)=\sin \left( 3x+1 \right)$. Khẳng định nào sau đây đúng?
A. $\int{f\left( x \right)\text{d}x}=-\dfrac{1}{3}\cos \left( 3x+1 \right)+C$.
B. $\int{f\left( x \right)\text{d}x}=-3\cos \left( 3x+1 \right)+C$.
C. $\int{f\left( x \right)\text{d}x}=\dfrac{1}{3}\cos \left( 3x+1 \right)+C$.
D. $\int{f\left( x \right)\text{d}x}=3\cos \left( 3x+1 \right)+C$.
A. $\int{f\left( x \right)\text{d}x}=-\dfrac{1}{3}\cos \left( 3x+1 \right)+C$.
B. $\int{f\left( x \right)\text{d}x}=-3\cos \left( 3x+1 \right)+C$.
C. $\int{f\left( x \right)\text{d}x}=\dfrac{1}{3}\cos \left( 3x+1 \right)+C$.
D. $\int{f\left( x \right)\text{d}x}=3\cos \left( 3x+1 \right)+C$.
Ta có $\int{f\left( x \right)\text{d}x}=-\dfrac{1}{3}\cos \left( 3x+1 \right)+C$.
Đáp án A.
