sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=?

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sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=?

sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=?
sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=?

sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=?
sinacosa/(1-cos2a)=1,sinacosa=1-cos2a=1-(1-2sin^2a)
sinacosa=2sin^2a
sina=0或 cosa=2sina
(1) sina=0 a=kπ
tan(a-B)=-tanB=-2/3
tanB=2/3
tan(B-2a)=tan(-2kπ+B)=tanB=2/3
(2) cosa=2sina
tana=1/2 tan2a=2tana/(1-tan^2a)=4/3
tan(a-B)
=(tana-tanB)/(1+tanatanB)
=(1/2-tanB)/(1+tanB/2)
=-2/3
tanB=7/4
tan(B-2a)
=(tanB-tan2a)/(1+tanBtan2a)
=(7/4-4/3)/(1+7/4*3/4)
=1/(1+21/16)
=16/37

已知tan=3 求(cos2a+sinacosa)/(cos2a+1) 已知tan=1/2,求1-cos2a/sinacosa, 已知tana=-1/3,计算1/(2sinacosa+cos2a) tana=1/3,cos2a+sinacosa的值 tana=-1/2,求（sinacosa）/cos2a 等于? tana=3(1)sinacosa?(2) sin2a-cos2a? 求证:1+2sinacosa/sin2a-cos2a=tana+1/tan-1 已知tana=2求2sina-cosa/sina+cosa求1-2sinacosa/sin2a-cos2a 已知tana=2求2sin2a-sinacosa+cos2a-1的值 已知tana=-1/2,则2sinacosa/sin2a-cos2a的值是 已知2sina+cosa=0,则(1+2sinacosa)/(sin2a-cos2a)的值是 已知tana=2,化简1/sin2a-sinacosa-3cos2a.那个2是平方. 已知sina-2cosa=0 sin2a+sinacosa+3cos2a ( sin2a+sinacosa)/(sin2a+1) (sina+3cosa)/(2sina+5cosa) 已知(1-cos2a)/(sinacosa)=1,tan(b-a)=-1/3,则tan( b-2a)等于多少? 已知(1-cos2a)/(sinacosa)=1,tan(b-a)=-1/3,则tan( b-2a)等于多少? sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=? 已知角a、B为锐角,且1-cos2a=sinacosa,tan(B-a)=1/3,则B= sinacosa/(1-cos2a)=1,tan(a-B)=-2/3,则tan(B-2a)=?