已知:tan(a-b)=sin2a/(5-coa2b),求证2tana=3tanb
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![已知:tan(a-b)=sin2a/(5-coa2b),求证2tana=3tanb](/uploads/image/z/11625851-11-1.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%9Atan%28a-b%29%3Dsin2a%2F%285-coa2b%29%2C%E6%B1%82%E8%AF%812tana%3D3tanb)
已知:tan(a-b)=sin2a/(5-coa2b),求证2tana=3tanb
已知:tan(a-b)=sin2a/(5-coa2b),求证2tana=3tanb
已知:tan(a-b)=sin2a/(5-coa2b),求证2tana=3tanb
利用1+(tanx)^2=1/(cosx)^2 进行化简:
(tanA)^2=2*(tanB)^2 +1
[1/(cosA)^2]-1=[2/(cosB)^2]-1
2(cosA)^2=(cosB)^2
2[1-(sinA)^2]=1-(sinB)^2
2-2(sinA)^2=1-(sinB)^2
(sinB)^2=2(sinA)^2 -1