1 . 记△ABC的内角A,B,C的对边分别为a,b,c,已知
.
(1)求
.
(2)若点D在边AC上,且
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/601d2dff616399f07cb4efd87afd7081.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d205e2a0a9ca85f52f973bcf986bb3.png)
(2)若点D在边AC上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0be3a60fe5a925f1159fc958372eb2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f787941cb1abfe9bb757276b765c0b.png)
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2022-12-30更新
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6卷引用:广西玉林、贵港、贺州市2023届高三联合调研考试(一模)数学(文)试题