在△ABC中,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629993915/SYS201310241829196299939027_ST/0.png)
.
(1)求AB边的长度;
(2)求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182919629993915/SYS201310241829196299939027_ST/1.png)
的值.
考点分析:
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