已知△ABC的三个内角A,B,C所对的边分别为a,b,c.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082018_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082018_ST/1.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082018_ST/2.png)
.
(Ⅰ)求A的大小;
(Ⅱ)若a=1,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082018_ST/3.png)
.求S
△ABC.
考点分析:
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