已知函数
在区间
上至少含有20个零点时,
的最小值是_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1f6c82e3ec8f78c91112cbd5a4b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f030c36bb8786df88d401792062a4100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13502d46b8563c54c09b29b20b3006a4.png)
更新时间:2020-01-16 13:17:29
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【知识点】 三角函数图象的综合应用解读
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