在
中,
,
,
为三个内角
为相应的三条边,若
,且![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/0e31d5f438e44b2eb87b5a5e7da86b37.png)
(1)求证:
;
(2)若
,试将
表示成
的函数
,并求
值域.
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/98ddb10b45724512b6ea68c025f58314.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/31264a6f37ad4d14a3242ac71a90ce43.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/682635c87a6049938bdad1a2790e6636.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/731d1ecdaea2486eab7862a5663f2782.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/3ae43d74c2f84a8ea045184e21551dd4.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/cfcb5e1b12dd434780db7e34bb61bbe8.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/0e31d5f438e44b2eb87b5a5e7da86b37.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/1055ed7aeb40408190d9ee738e366091.png)
(2)若
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/54ac7218e4224e2bb87688eb48fc7678.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/0fb9b196c1164d23a423f9eed588c9e8.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/731d1ecdaea2486eab7862a5663f2782.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/9db534ec91e546178c0a52d920df653b.png)
![](https://img.xkw.com/dksih/QBM/2016/2/24/1572496155541504/1572496161685504/STEM/9db534ec91e546178c0a52d920df653b.png)
更新时间:2016-12-04 02:34:32
|
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适中
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解题方法
【推荐2】
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