设函数
,已知方程
(
为常数)在
上恰有三个根,分别为
,下述四个结论:
①当
时,
的取值范围是
;
②当
时,
在
上恰有2个极小值点和1个极大值点;
③当
时,
在
上单调递增;
④当
时,
的取值范围为
,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd18bea0c022e42f98212d3d1ca138e.png)
其中正确的结论个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83267c899858b77371e843f78a84a96a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c342d52fc26cc550a45b80756903bee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef43a42937b44dbe99fe0afef1f3f309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcee20976de0e0e8c1ccd7a951674691.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074c228ffc7b1e306f8410afe7bc4b5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc8ae783ddd125c16ff9db744d267a4.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef43a42937b44dbe99fe0afef1f3f309.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b4d795709b0abcf47bceec2250f2f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bf8f461cef9ce98043fd0ab9f6e742d.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05a467ddaa138590b3b56615c2c42a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14f29b510bdeef37921d7fa449600db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acd18bea0c022e42f98212d3d1ca138e.png)
其中正确的结论个数为( )
A.1 | B.2 | C.3 | D.4 |
更新时间:2020-06-13 00:40:10
|
【知识点】 正、余弦型三角函数图象的应用解读
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