A,B,C为三角形ABC的内角,R为三角形ABC外接圆半径,r为△ABC内切圆半径.
(1)求证:tanA+tanB+tanC=tanAtanBtanC(A,B,C
);
(2)求证:
.
(1)求证:tanA+tanB+tanC=tanAtanBtanC(A,B,C
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b89e8d0488405d7ef6044f98d31c8a21.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42b9ba4534b7864463da1c2a258f8bb.png)
12-13高三上·安徽滁州·期末 查看更多[1]
(已下线)2012届安徽省滁州中学高三上学期期末考试文科数学
更新时间:2016-12-01 14:51:09
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适中
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【推荐2】在
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适中
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