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2019年高考数学大二轮复习第三篇考前回扣查缺补漏回扣落实（三）三角函数与平面向量课件理.ppt

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回扣落实（三） 三角函数与平面向量,1在解决三角函数问题时，应明确正切函数的定义域，正弦函数、余弦函数的有界性 回扣问题1 函数f(x)tan xcos x的值域是_ 答案 (1，1),答案 A,5两向量夹角的范围为0，向量的夹角为锐角与向量的数量积大于0不等价 回扣问题5 已知a(2，1)，b(，1)，R，a与b的夹角为.若为锐角，则的取值范围是_,

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