tanA=1,得A=kπ+π/4,k属于z,3sinB=sin(2A+B)=sin2AcosB+cos2AsinB,两边同除cosB,得3tanB=sin2A+cos2AtanB2A=2kπ+π/2,k属于zsin2A=1,cos2A=0 代入,得3tanB=1,tanB=1/3 tan(A+B)=(tanA+tanB)/(1-tanAtanB...