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