已知2sin(3π+φ),求2sin²φ+3sinφcosφ-cos²φ的值

已知1+sin^2φ=3sinφcosφ,求tanφ(急求!) 已知sin(3π+a)=2sin[(3π/2)+a],求sin^2a+sin2a的值 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x) 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2 已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围 已知sin(α+β)*sin(α-β)=-1/3,求sin^2α-sin^2β的值 已知2sin(3π+φ),求2sin²φ+3sinφcosφ-cos²φ的值 已知sin(π/6+a)=（根号3）/3,求sin(2π/3+a)? 1.已知2sin(3π+θ）=cos(π+θ）,求2sin sin（-19π/6）=?已知[3Sin(π+a)+Cos(π-a)]/4Sin(-a)-Sin(5π/2+a)=2，求tan a 已知sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值. 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα 已知：3sin^2α+2sin^2β=2sinα,求sin^2α+sin^2β的值 已知3sin^2α—2sinα+2sin^2β=0 求sin^2α+sin^2β的取值范围 已知3sin^2α+2sin^2β=2sinα,求sin^2α+sin^2β的值 已知3(sinα)^2-2sinα+2(sinβ)^2=0,试求(sinα)^2+(sinβ)^2的取值范围 已知sinα=-3sinα.求①(sinα+2cos)/(2sinα-cosα).②(sinα^2)-(3cosα^2)+1