已知sin(45°-α)=-2/3,45°

已知sin(45°-α)=-2/3,45° 已知sin(45°-α)=-1/2,45° 已知sin(45度-α)=-2/3 (45度 已知sin(45°-a)=-2/3,45° 已知sin(45度-α)=-2/3,π/4 诱导公式 200分1.化简:sin(30°+α)×tan(45°+α)×tan(45°-α) sec(60°-α)2.求值:sin²1°+sin²2°+sin²3°+.+sin²89°3.已知θ=(0,2π),且sinθ、COSθ是方程X²-KX+K-1=0的根 求K和θ的值4.已知SINα+SINβ+SINr 已知sin(45°-α)=-2/3且45° 已知sin=1/4,45° 已知sin(3π-α)=-2sin(π/2+α)则sinαcosα 已知sin（2α+ β）=5sinβ,求证：2sin（α+ β）=3sinα 已知sin(α+β)*sin(α-β)=-1/3,求sin^2α-sin^2β的值 已知sinα=-3sinα.求①(sinα+2cos)/(2sinα-cosα).②(sinα^2)-(3cosα^2)+1 已知3sinα cosα=0,求 3cosα 5sinα/sinα-cosα与sin²α 2sinα 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3sin^2α+sin^2β=2sinα,求sin^2α+sin^2β的最大值