tana=根号2,求sin^2a-sina*cosa+2cos^2a

tanA=2 求(sin^2 A+ sinAcosA)/(tanA+1+sin^2 A) 急 . tana=根号2,求sin^2a-sina*cosa+2cos^2a tana=根号2 ,求sin²a-sinacosa+2cos²a 已知sina+cosa=根号2,求sinacosa,tana,sin^4a+cos^4a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 已知tana=3 ,求(sin²a+sinacosa)/(cos²a+2sin²a) 化简tana*根号(1-sin^2a).[(-π/2) tana=2 sin平方a= 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 若tana 根号2,求1/3sin^2a+cos^2a a是第二象限角，且sin(a-7π/4)=根号2/10 求tana/2 已知(tana-1)/tana=-1 求1/sin^2a+2sinacosa-cos^2a sin(π/4+α)sin(π/4-α)=1/4 求2sin^2(a) -1+tana-1/tan