A. \(I = {x^2}\sin x\left| {_0^\pi } \right. + \int\limits_0^\pi {x\sin x{\rm{d}}x} \)
B. \(I = {x^2}\sin x\left| {_0^\pi } \right. + 2\int\limits_0^\pi {x\sin x{\rm{d}}x} \)
C. \(I = {x^2}\sin x\left| {_0^\pi } \right. - 2\int\limits_0^\pi {x\sin x{\rm{d}}x} \)
D. \(I = {x^2}\sin x\left| {_0^\pi } \right. - \int\limits_0^\pi {x\sin x{\rm{d}}x} \)
C
Ta có: \(u={{x}^{2}}\Rightarrow \text{d}u=2x\text{d}x,\text{d}v=\cos x\text{d}x\Rightarrow v=\operatorname{s}\text{inx}\)
Suy ra: \(I={{x}^{2}}\sin x\left| _{0}^{\pi } \right.-2\int\limits_{0}^{\pi }{x\sin x\text{d}x.}\)
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