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已知在△ABC中,,a,b,c分别是角A,B,C所对的边.(1)求tan2A;(2)若,求...
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已知在△ABC中,
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAEAAAAAkCAYAAAA5DDySAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,a,b,c分别是角A,B,C所对的边.
(1)求tan2A;
(2)若
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAJ4AAAAkCAYAAAB41INoAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
,求△ABC的面积.
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