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	Các bình luận về: Cho hàm số \(f(x) = \left\{ \begin{array}{l}2{x^2} + 1\,\,\,\,\,\,\,\,\,\,\,\,\,{\rm{khi }}x \ge 0\\2{x^2} &#8211; x + 1\,\,\,\,\,{\rm{khi }}x &#060; 0\end{array} \right.\). Tính tích phân \(\int\limits_0^{\frac{\pi }{3}} {f\left( {3\cos x &#8211; 2} \right)} \sin x{\rm{d}}x\).	</title>
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