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Câu hỏi: Nguyên hàm của hàm số $y=\sin \left( 2021x \right)$ là
A. $\int{f\left( x \right)\text{d}x=}\dfrac{1}{2021}c\text{os}\left( 2021x \right)+C$.
B. $\int{f\left( x \right)\text{d}x=}-\dfrac{1}{2021}c\text{os}\left( 2021x \right)+C$.
C. $\int{f\left( x \right)\text{d}x=}2021c\text{os}\left( 2021x \right)+C$.
D. $\int{f\left( x \right)\text{d}x=}-2021c\text{os}\left( 2021x \right)+C$.
A. $\int{f\left( x \right)\text{d}x=}\dfrac{1}{2021}c\text{os}\left( 2021x \right)+C$.
B. $\int{f\left( x \right)\text{d}x=}-\dfrac{1}{2021}c\text{os}\left( 2021x \right)+C$.
C. $\int{f\left( x \right)\text{d}x=}2021c\text{os}\left( 2021x \right)+C$.
D. $\int{f\left( x \right)\text{d}x=}-2021c\text{os}\left( 2021x \right)+C$.
Ta có $\int{f\left( x \right)\text{d}x=}\int{\sin \left( 2021x \right)\text{d}}x=-\dfrac{1}{2021}c\text{os}\left( 2021x \right)+C$
Đáp án B.