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	Các bình luận về: Đề bài: Nếu \(\int\limits_0^1 {xf\left( x \right)d{\rm{x}}}  = 4\) thì \(\int\limits_0^{\frac{\pi }{4}} {f\left( {{\rm{cos}}2{\rm{x}}} \right)} \sin 4{\rm{xdx}}\) bằng:	</title>
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