A. \(I = \left. {{x^2}\sin x} \right|_0^\pi - \int\limits_0^\pi {x.\sin xdx} \)
B. \(I = \left. {{x^2}.\sin x} \right|_0^\pi + 2\int\limits_0^\pi {x.\sin xdx} \)
C. \(I = \left. {{x^2}\sin x} \right|_0^\pi - 2\int\limits_0^\pi {x.\sin xdx} \)
D. \(I = \left. {{x^2}\sin x} \right|_0^\pi + \int\limits_0^\pi {x.\sin xdx} \)
C
\(I = \int\limits_0^\pi {{x^2}\cos xdx} \).
Đặt \(\left\{ \begin{array}{l}u = {x^2}\\dv = \cos xdx\end{array} \right. \Rightarrow \left\{ \begin{array}{l}du = 2xdx\\v = \sin x\end{array} \right.\).
\( \Rightarrow I = \left. {{x^2}\sin x} \right|_0^\pi - 2\int\limits_0^\pi {x.\sin xdx} \).
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