tanA+tanB+根号3=根号3 乘以tanAtanB
tanA+tanB=-√3[1-tanAtanB
tan(A+B)=-√3
tanC=√3,
C=60
sinAcosB=√3/4
1/2[sin(A+B)+sin(A-B)]=√3/4
sin(A-B)=0
A=B
故是等边三角形
tanA+tanB+根号3=根号3 乘以tanAtanB
tanA+tanB=-√3[1-tanAtanB
tan(A+B)=-√3
tanC=√3,
C=60
sinAcosB=√3/4
1/2[sin(A+B)+sin(A-B)]=√3/4
sin(A-B)=0
A=B
故是等边三角形