同时满足:①
为偶函数,②
,③
有最大值,这三个条件的选项有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c2e0bb6d63b7bcaee92a470d58cc399.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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更新时间:2024-05-25 19:20:22
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【推荐1】下列函数
中,满足“对任意
,且
都有
”且值域是
的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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【推荐2】已知函数
的图象在
处切线的斜率为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d50da766cb5304b47f3e5551d3477fc.png)
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【推荐1】若函数
同时满足:①对于定义域上的任意
,恒有
;②对于定义域上任意
,当
时,恒有
,则称函数
为“
函数”.下列函数中的“
函数”有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】已知函数
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【推荐1】一般地,对任意角
,在平面直角坐标系中,设
的终边上异于原点的任意一点
的坐标为
,它与原点的距离是
.我们规定:比值
分别叫做角
的余切、余割、正割,分别记作
,把
分别叫做余切函数、余割函数、正割函数.下列叙述正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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