求tan(a十B)

tan A:tan B:tan C=1:2:3 求A:B:C 2(tan a+tan b) 已知tan(A-B/2)=2,tan(B-A/2)=-3 求：(1) tan[(A+B)/2] (2) tan(A+B) tan(a+b)=3 tan(a-b)=5 求tan2a tan2b的值 tan(a+b)=-2,tan(a-b)=1/2,求sin2a/sin2b的值 已知 tan(A+B)=3tan(A-B) 求 sin2A/sin2B tan(a+b）=3,tan(a-b)=1/2,求sin2a/sin2b tan(a+b)=2/5,tan(a-b)=1/4,求tana,tanb,tan2a tan(a+b)=3,tan(a-b)=5,求tan2a和tan2b的值 已知tan(a+b)=3,tan(a-b)=5,求tan2a,tan2b的值~ tan(a+b)=5,tan(a-b)=3求tan2a,tan2b的值? tan(a-3/π) =2 tan(3/π-B)=2/5 求tan（a+b）=