真题
解题方法
1 . 在
ABC中,
.
(Ⅰ)证明B=C:
(Ⅱ)若
=-
,求sin
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e033f67841bcb481db65d3ce495f0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a20d3583ef09be79436ca9da6067201.png)
(Ⅰ)证明B=C:
(Ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5201fc26d013f6fb889933c0e32f5c53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f16d6fdf6f228ad69ee0f15493e8092.png)
您最近一年使用:0次
真题
2 . 已知
.
(Ⅰ)求
的值;
(Ⅱ)求
的值.
![](https://img.xkw.com/dksih/QBM/2010/4/1/1569688487706624/1569688629960704/STEM/7df6c5fb6d694cf3b7a0c2f19bee5b77.png)
(Ⅰ)求
![](https://img.xkw.com/dksih/QBM/2010/4/1/1569688487706624/1569688629960704/STEM/c06797a511ed4e3c8b56f936c645d22b.png)
(Ⅱ)求
![](https://img.xkw.com/dksih/QBM/2010/4/1/1569688487706624/1569688629960704/STEM/a807225eb40a434cbbe8f0ce75c5cf10.png)
您最近一年使用:0次