【在△ABC中,已知a,b,c为角A,B,C得对边,A,B为锐角,且cos2A=3/5,sinB=10/√10c=√...在△ABC中,已知a,b,c为角A,B,C得对边,A,B为锐角,且cos2A=3/5,sinB=10/√10c=√5求ABC面积】
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