解题方法
1 . 已知
,
是锐角,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24065d444e68ede7fe10b02e92b70d7d.png)
您最近一年使用:0次
2 . 确定下列各三角函数值的符号:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
;
(6)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f68727d6e73346ef1dd076b13158960.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d3a3329591d907c90517900db1ff1cd.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91c76281d0a07559904e126056224c50.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08d5c81106fc05e0a563af6a962c89c3.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae3e3b8e37d8aff2683a7e45871fa4a3.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f100462befbdb4dac54df56707a55d44.png)
您最近一年使用:0次
3 . 确定下列各式的符号:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cdd96ea168f7aadf8658c0248b3b9f1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b5ffe9312269a0dfd39edebe766f7cb.png)
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4 . 在单位圆中,确定下列三角函数值的符号:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a174e0732d681af49fe43b6d5137f822.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642c97290a730c9f87507b54a5c51de.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25699e5cdc573e3b5342959893204b9a.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35bda74bb7e327b5e0035319684c4a6b.png)
您最近一年使用:0次
2023-10-08更新
|
296次组卷
|
3卷引用:北师大版(2019)必修第二册课本习题第一章4.1单位圆与任意角的正弦函数、余弦函数定义
北师大版(2019)必修第二册课本习题第一章4.1单位圆与任意角的正弦函数、余弦函数定义(已下线)4.1 单位圆与任意角的正弦函数、余弦函数定义北师大版(2019)必修第二册课本例题4.1 单位圆与任意角的正弦函数、余弦函数定义
5 . 已知
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c04ca22dba343e23584976deeedf071f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d1058568054a1802103b8247de3a041.png)
您最近一年使用:0次
解题方法
6 . 利用正弦线、余弦线、正切线研究各象限角的三角函数的符号.
您最近一年使用:0次
7 . 确定下列三角函数值的符号:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe50c6bfb383abe2c5bb1b317d83bec.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3df99fc895580415bffa587ed1db56.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb88c3ad16263c4628eee02fa4e23a2.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85083901a8ce2a7e6a8cc25d6e3d9747.png)
您最近一年使用:0次
8 . 确定下列三角函数值的符号:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17da7c7706b8ee10778c8db575315043.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9559cf40651f7aa01584b3d00920768a.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969155d28cf61113460076de8e91555c.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866c374e044b899f397f11c45766e236.png)
您最近一年使用:0次
9 . 确定下列各角的正弦、余弦、正切值的符号:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99be4eebc39a11e138b0e5d1cd9dec7.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c9a71b2b63608564ab8691bc97473ad.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82a36e5d5cd1b6b26433fdda2bc2af1.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ad0762df2e86af61058d1081289881b.png)
您最近一年使用:0次
21-22高一·湖南·课后作业
10 . 确定下列各三角函数值的符号:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62c690aacc2d55242417aad21ec69ca5.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f38aca3b7375ef93bf4aaeeca28d86.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9fde0e3996f8f69c2576573e48b5e9d.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26b0977cb7a5b8a9cc65b832d45811b9.png)
您最近一年使用:0次