求证tan(a+π/4)=(1+tana)/(1-tana)
求证tan(a+π/4)=(1+tana)/(1-tana)
求证tan(A/2)-{1/(tanA/2)}=-2/tanA
求证tan(a/2)-1/(tana/2)=-2/tana
化简tana+(1+tana)tan(π/4-a)
求证:tan(nπ+a)=tana
求证,cos²a-sina×cosa+tana/cos²a+sina×cosa-tana=1+tan
求证tana+seca=tan(a/2+π/4)
求证tan(A-B)=(tanA-tanB)/(1+tanAtanB)
已知:tan(A-B)\tanA+(sinC/sinA)*(sinC/sinA)=1,求证tanA*tanB=tanC*
证明:tan(A-B)\tanA+(sinC/sinA)*(sinC/sinA)=1,求证tanA*tanB=tanC*
已知1-tanA/1+tanA=2+根号3,则tan(π/4+A)是
若1-tanA/1+tanA=根号5,则tan(π/4+a)