已知3Sin2b=sin(2a+b)证明:tan(a+b)=2tana
已知3Sin2b=sin(2a+b)证明:tan(a+b)=2tana
tan(a+b)=3tana 证明2sin2b-sin2a=sin(2a+2b)
已知2tanA=tanB,求证:tan(A-B)=sin2B/(5-cos2B)
求证:tan(a+b)-tana\1+tanatan(a+b)=sin2b\2cos^2b
已知tan(a-r)/tana+sin^2b/sin^2a=1 ,求证tan^2b=tana*tanr..
求证sin与tan 已知3sinB=sin(2A+B),求证tan(A+B)=2tanA
已知5sinb=sin(2a+b) 求证 tan(a+b)/tana=3/2
已知3sinB=sin(2A+B),求证tan(A+B)=2tanA
已知tana=1,3sinB=sin(2a+B),求tan(a+b/2)
已知tanA=1,sin(2A+B)=3sinB,求tan(A+B)?
已知3sinb=sin(2a+b),则tan(a+b)/tana=
已知3sinb=sin(2a+b)且tana=1,求tan(a+b).