tan(a-b)=-2.tana=3.tanb=?rtrtrtrtrtrtrtrt

tan(A+B)=tanA+tanB+tanAtanB? tan(a+b)-1/tana=2*tana 请化简! 证明 tana+tanb=tan(a+b)-tana *tanb *tan(a+b) 求证：化简[tan(A+B)-tanA-tanB]÷[tanA·tan(A+B)]=tanB.RT tan(a-b)=-2.tana=3.tanb=?rtrtrtrtrtrtrtrt tana+tanb=tan(a+b)-tanatanbtan(a+b)证明 tan(360-a)=-tana 已知tanA+tanB=2.tan(A+B)=4.且tanA＜tanB.求cos(A-B)的值 已知锐角A.B满足tan(A+B)=2tanA,则tanA的最大值为? tanA+tanB=tan(A+B)(1-tanAtanB)是什么公式? 证明tan(A+B) = (tanA+tanB)/(1-tanAtanB) tan(A+B)=(tanA+tanB)/(1-tanAtanB) 求证tan(A-B)=(tanA-tanB)/(1+tanAtanB) tana=1/2..tan(a-b)=-1/2求tan（b-2a)的值? 已知tan(a-r)/tana+sin^2b/sin^2a=1 ,求证tan^2b=tana*tanr.. 已知tan(A-B)/tanA+sin^2C/sin^2A=1,求证：tanA×tanB＝tan^C求证tanA×tanB＝tan^2C tan(2a+b)=3,tan(a+b)=1,tana= tan(a+b)=2/5,tan(a-b)=1/4,求tana,tanb,tan2a