解题方法
1 . 已知等腰三角形一个底角的正弦值为
,求这个三角形的顶角的正弦、余弦及正切的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
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解题方法
2 . 已知
,求
,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef966cdd137b3b10e290201b4d17542e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850dba25bf0f5f13541bf9b6ec12b84d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc4b61fc602d0d8fa5622077945ea37.png)
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2023-10-09更新
|
104次组卷
|
3卷引用:北师大版(2019)必修第二册课本习题 习题4-3
解题方法
3 . 已知
,
,求
,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3d19725b200c42b536b7e251f8a6e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59293fd84aa30bd783d0f89e7c52e40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850dba25bf0f5f13541bf9b6ec12b84d.png)
您最近一年使用:0次
解题方法
4 . 已知
,
,求
,
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d15b377e37c9e0fcbfce046148bdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f201f6e84279e80b85f394f4d930ed41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f90c4754e6b6fc862d72943fb35569.png)
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5 . 求下列各式的值:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
;
(6)
;
(7)
;
(8)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd43cae6b8b0f13024b093d6167de58f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd577259d75f70140b2d36677893991.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0008e2b244db40a1f751b87c1557ec1.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e12bfe92776c23e00b5291af2e12db3.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/493ad8638f013c9c635b2e2594c7cc2f.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c18e2777e711d1582eb99afef920e10.png)
(7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/803101f29c1c6318377cf02050e12138.png)
(8)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c7ac24df17ca02f294375b63679e04d.png)
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6 . 化简:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897eafc2972ca2cb0b0ab4e5279662c6.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897eafc2972ca2cb0b0ab4e5279662c6.png)
您最近一年使用:0次
解题方法
7 . 已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b98a645d4f3e06cb5f1ff75e1c24234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b7a83ac01f453be15d2d23d4f79024.png)
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解题方法
8 . 已知
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fed18c4c4dab6dba87121a631118fc78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9146fc0a63e5c14a8fa46573e60c07ba.png)
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解题方法
9 . 利用特殊角的三角函数值计算:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
;
(6)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f804115867145d0830996a4372702823.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2faa5a5696fbf0f7bc4bf4dde578d3c.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b2cd313332b523b5046fedd4e926aa.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b77f94bddb78e3d8a4b4166c9bb75f9.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f87c5488d28c039d315f97f25ee9976.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d509f5a2e0c587cfbec1795fac7fbed2.png)
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解题方法
10 . 在
中,已知
,
,求
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfeaf26f178031f78a5545233a2a73f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88a95f9136fe8f648f21b332447a49d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f3a180c35808d1fe14ae17876c4cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e5dc31ddd298ec8ee56d934ca18e1b.png)
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2023-10-09更新
|
65次组卷
|
3卷引用:北师大版(2019)必修第二册课本习题第四章3.1二倍角公式