tanA=3,tan(A-45度)=?
tanA=3,tan(A-45度)=?
若1-tanA/1+tanA=2+√3,则tan(45°+A)等于
tana+1/tana=3,求sina*cosa tan^2 a+1/tan^2 a
tan²a-2tana-3=0.tana=3或tana=-1
tan(a+b)-1/tana=2*tana 请化简!
求证tan(A/2)-{1/(tanA/2)}=-2/tanA
求证tan(a+π/4)=(1+tana)/(1-tana)
求证tan(a/2)-1/(tana/2)=-2/tana
已知tana=2,则tan(90度-a)=?
tan(90°-a)=-tana是吗?
求证:tan(nπ+a)=tana
tan(A+B)=tanA+tanB+tanAtanB?