证明下列等式:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57325e34923a0420a245bcdf989012fe.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c864f8d6d8bd223f177f4cb26de6e30.png)
21-22高一·全国·课后作业 查看更多[3]
更新时间:2023-07-07 17:31:08
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解答题-问答题
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较易
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【推荐1】在
中,
分别为内角
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.
(Ⅰ)求
;
(Ⅱ)若
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284209bed076785a19b21c322c5fca40.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23bc605bb148b75845c61fcb789d9c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/980ab4deb9e7f2bc9288787f5243a4d2.png)
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】在△ABC中,内角A,B,C所对的边分别为a,b,c,已知
,c=
,sin A=
sin C,A为锐角.
(1)求sin A与a的值;
(2)求b的值及△ABC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efab3e02f14a97f895356890c3bedaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
(1)求sin A与a的值;
(2)求b的值及△ABC的面积.
您最近一年使用:0次