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