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【函数培优】三角函数比大小题型，介绍一个重要的三角不等式
【函数培优】三角函数比大小题型，介绍一个重要的三角不等式！ sinx<x<tanx 当x值充分小时，三个函数值很接近
【高考数学】函数与导数26/53
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