一般地,任意给定一个角
,它的终边
与单位圆的交点
的坐标,无论是横坐标
还是纵坐标
,都是唯一确定的,所以点
的横坐标
、纵坐标
都是角
的函数.下面给出这些函数的定义:
的纵坐标
叫作
的正弦函数,记作
,即
;
②把点
的横坐标
叫作
的余弦函数,记作
,即
;
③把点
的纵坐标
的倒数叫作
的余割,记作
,即
;
④把点
的横坐标
的倒数叫作
的正割,记作
,即
.
下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd1adf2f585d7c3f22e6755c2a545ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8f798a9af75a091a8be0b71f2038260.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74b5644d2be8b74f1bc61bf90efc87a8.png)
②把点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a282d19bf2c827a98d4443330f7ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9320c4f0e8a937495d22f2ddb50f93f3.png)
③把点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb7866904d35a4e6d7ff6e2639270a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2692ac8eb7a6934c2ba4b8ff30735c7.png)
④把点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9085195f5d04d5e224f4c8df470a9c7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33476d63f1cab19df8fc0ff420eaa636.png)
下列结论正确的有( )
A.![]() |
B.当![]() ![]() |
C.函数![]() ![]() |
D.当![]() ![]() ![]() |
更新时间:2024-05-24 13:21:57
|
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