$$$x \sin{\left(x \right)} \cos^{2}{\left(x \right)}$$$ 的积分
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求$$$\int x \sin{\left(x \right)} \cos^{2}{\left(x \right)}\, dx$$$。
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求$$$\int x \sin{\left(x \right)} \cos^{2}{\left(x \right)}\, dx$$$。