在△ABC中,角A,B,C所对的边分别为a,b,c,且满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225323511049309/SYS201311012253235110493017_ST/0.png)
.
(1)求
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;
(2)若b+c=6,求a的值.
考点分析:
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定义运算
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225323511049309/SYS201311012253235110493013_ST/0.png)
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