tana=0.5 tan(a-b)=-2/3求tan(b-2a)
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tana=0.5 tan(a-b)=-2/3求tan(b-2a)
tana=0.5 tan(a-b)=-2/3求tan(b-2a)
tana=0.5 tan(a-b)=-2/3求tan(b-2a)
tan(b-a)=-tan(a-b)=2/3
所以tan(b-2a)=tan[(b-a)-a]
=(2/3-0.5)/(1-2/3*0.5)
=1/4
tan(a+b)-1/tana=2*tana 请化简!
tana=0.5 tan(a-b)=-2/3求tan(b-2a)
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