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	Các bình luận về: Cho hàm số có bảng biến thiên như sau:







Số nghiệm đoạn \(\left[ { &#8211; 2\pi;2\pi } \right]\)của phương trình \(4f\left( {\cos x} \right) + 5 = 0\)là	</title>
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	<description>Học toán, Đề thi toán, Sách giáo khoa Toán, trắc nghiệm Toán online</description>
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