21-22高一·全国·课后作业
1 . 判断正误.
(1)
.( )
(2)当角
的终边与坐标轴重合时,
.( )
(3)当
时,
.( )
(4)由于平方关系对任意角都成立,故
也成立.( )
(5)当
时,
.( )
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e563e85e2d6c504ba796169e4bf151.png)
(2)当角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29efc5099ce90bbf14e104a7b05cce1.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bc052a11cf1a01445992672dde2836.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a077ceccea768ed3c664d38d55242fbd.png)
(4)由于平方关系对任意角都成立,故
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dcb897d54e85c8bc3ba4b795a968518.png)
(5)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d181e47c82a2e8b0e8990fbe198451c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b3f5f49bf6370222b6e6a2de73cb6c5.png)
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