若tana=2,求sin^2a-2sinacosa+3cos^2a的值

tanA=2 求(sin^2 A+ sinAcosA)/(tanA+1+sin^2 A) 急 . tana=2,求sin^2a-cos^2a tana=2 求sin²+a+sinacosa tanA=2,求sin平方A-3sinAcosA 已知tana=2 求sin^a+3sinacosaguocheng tana=2 sin平方a= 已知tana=3 ,求(sin²a+sinacosa)/(cos²a+2sin²a) 已知sin(A+B)=2/3,sin(A-B)=1/5.求tanA/tanB 已知sin(a+b)=1/2,sin（a-b)=1/3,求tana/tanb 已知sin(a+b)等于2/3,sin(a-b0 =1/5,求tana:tanb 已知(tana-1)/tana=-1 求1/sin^2a+2sinacosa-cos^2a 若1+sin^2=3sinacosa,求tana sin(π/4+α)sin(π/4-α)=1/4 求2sin^2(a) -1+tana-1/tan 若tana=2则sin^2a+sinacosa 若tana=2,则sin²a= tana/2+tana/2=5/2,求sin(a-pai/3)1 已知tana/tana-1=-1,求sin²a+sinacosa+2的值? 已知tana/tana-1=-1,求sin的平方a+sinacosa+2的值.