2tana=3tanb,求证tan(a-b)=sin2b/5-cos2b.
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2tana=3tanb,求证tan(a-b)=sin2b/5-cos2b.2tana=3tanb,求证tan(a-b)=sin2b/5-cos2b.2tana=3tanb,求证tan(a-b)=sin
2tana=3tanb,求证tan(a-b)=sin2b/5-cos2b.
2tana=3tanb,求证tan(a-b)=sin2b/5-cos2b.
2tana=3tanb,求证tan(a-b)=sin2b/5-cos2b.
tan(a-b)=[tana-tanb]/[1+tana*tanb]=[3/2*tanb-tanb]/[1+3/2*tanb*tanb]=tanb/[2+3(tanb)^2]。
sin2b=2tanb/[1-(tanb)^2],cos2b=[1-(tanb)^2]/[1+(tanb)^2],所以
sin2b/(5-cos2b)=2tanb/[5(1+(tanb)^2)-(1-(tanb)^2)]=2tanb/[4+6(tanb)^2]=tanb/[2+3(tanb)^2]。
所以,tan(a-b)=sin2b/(5-cos2b)。
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