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（福建专版）2019高考数学一轮复习课时规范练17同角三角函数的基本关系及诱导公式文.docx

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1课时规范练 17 同角三角函数的基本关系及诱导公式基础巩固组1.已知 sin(+ ) 0,则下列不等关系中必定成立的是( )A.sin 0B.sin 0,cos 0,cos 0D.sin log2x的解(5x) (5x)集为 . 答案：1.B sin(+ ) 0. cos(- ) 0,- cos 0,即 cos 0,cos log2x,即 1log2x,解得 0x2.

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