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CM KO PHỤ THUỘC VÀO BIẾN a)`\frac{sin^6x+cos^6x-1}{sin^4x+cos^4x-1}` b)`\frac{sin^4x+3cos^4x-1}{sin^6x+cos^6x+3cos^4x-1}` 40 ĐIỂM ĐẤY
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