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Câu hỏi: Cho hàm số $f\left( x \right)={{x}^{2}}-\cos x$. Khẳng định nào dưới đây đúng?
A. $\int{f \left( x \right)\text{d}x}=2x-\sin x+C$.
B. $\int{f \left( x \right)\text{d}x}=\dfrac{{{x}^{3}}}{3}+\sin x+C$.
C. $\int{f \left( x \right)\text{d}x}=\dfrac{{{x}^{3}}}{3}-\sin x+C$.
D. $\int{f \left( x \right)\text{d}x}=2x+\sin x+C$.
A. $\int{f \left( x \right)\text{d}x}=2x-\sin x+C$.
B. $\int{f \left( x \right)\text{d}x}=\dfrac{{{x}^{3}}}{3}+\sin x+C$.
C. $\int{f \left( x \right)\text{d}x}=\dfrac{{{x}^{3}}}{3}-\sin x+C$.
D. $\int{f \left( x \right)\text{d}x}=2x+\sin x+C$.
Ta có $\int{f \left( x \right)\text{d}x}=\int{\left( {{x}^{2}}-\cos x \right)\text{d}x=}\dfrac{{{x}^{3}}}{3}-\sin x+C$.
Đáp án C.