名校
1 . 在
中,
.
(1)求
的值;
(2)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefd174b923bedc5a094cd2120e93bf8.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa468d13cbc7c4602094dabd468638c1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66bc7964f72e39afd6d4c65eef545065.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b21bdea15993d7447c9bee28f7318bc9.png)
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名校
解题方法
2 . 已知
,
为锐角,
,
.则
的值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b37d8f955cafe898413efd0ebed6d9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710be94194896bce781527e733acb362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d8d24b6d6dd0717c226569e345d9f0.png)
您最近一年使用:0次
名校
解题方法
3 . 若
,
为锐角,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c306d0a6bb34b2125e5acb10d3208dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fbe2212c10c3da621f550e8c6409bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34224b33b90a9466d29c571d52bb165a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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