由tanA=2tan(A/2)/[1-(tan(A/2)^2)]得出tanA=4/3
1.
tan(A+π/4)=(tanA+1)/(1-tanA)=-7
2.
(6sinα+cosα)/(3sinα-2cosα)上下都除以cosα
得到(6tanα+1)/(3tanα-2)=4.5
由tanA=2tan(A/2)/[1-(tan(A/2)^2)]得出tanA=4/3
1.
tan(A+π/4)=(tanA+1)/(1-tanA)=-7
2.
(6sinα+cosα)/(3sinα-2cosα)上下都除以cosα
得到(6tanα+1)/(3tanα-2)=4.5