α∈(3π\4,5π\4),sin(α+π\4)=-3\5,则cosα= sin2α=
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已知sinα=4/5,求下列三角函数值1)sin(-α)2)sin(π-α)3)sin(π+α)4)sin(2π-α)
已知β∈[-π/6,π/4),且3(sinα)^2-2(sinβ)^2=2sinα,求(sinβ)^2-1/2sinα的最小值
若sinα-cosα=-1/5,α∈(3/2π,7/4π),求sinα与cosα 若sin(α+β)=1/2,sin(α-β)=1/3,求log√5(ta若sinα-cosα=-1/5,α∈(3/2π,7/4π),求sinα与cosα 若sin(α+β)=1/2,sin(α-β)=1/3,求log√5(tan*cotβ)若sinα-2cosα/3sinα+5
已知sinα(x+π/6)=1/4,则sin(5π/6-x)+sin(π/3-x)的平方=?
利用和差角公式化简 (2)sin(π/3+α)+sin(π/3-α)(2)sin(π/3+α)+sin(π/3-α)(3)cos(π/4+α)-cos(π/4-α)(4)cos(60°+α)+cos(60°-α)(5)sin(α-β)cosβ+cos(α-β)sinβ(6)cos(α+β)cosβ+sin(α+β)sinβ
已知sin(α+π/3)+sinα=-4√3/5(-π/2
若sin(π/4-α)=3/5 sin(π/4+β)=12/130
①[4sin(α-π)-sin(3π/2-α)]/[3cos(α-π/2)-5cos(α-5π)] ②sin^2-2sin^2αcosα-cos^2α
已知sin(α-3π)=2cos(α-4π),求sin(π-α)+5cos(2π-α)/2sin(3π/2-α)-sin(-α)的值
已知sin(α-3π)=2cos(α-4π),求sin(π-α)+5cos(2π-α) / [2sin(3/2π-α)-sin(-α)]
已知sin(α-π/4)=5/13 阿尔法∈(3π/4,π/4).求sinα的值
已知sinα=4/5,且3π/2<α<2π,求sinα-cosα及(1/cos²α)-(1/sin²α)刚才有些错误,sinα+cosα=4/5
已知tanθ=(sin α-cos α)/(sin α+cos α) a,θ(0,π/2) 求证cos(3/2兀+ α) -sin(5π/2-α)=根号2sin(θ-4π)
已知sin(α+π/3)+sinα = — 4根号3/5,— π/2第三题
已知sinα=-3/5,α是第四象限角,则sin(α-π/4)=
三角函数求解!难题我采纳!10.化简.(1)【sin(2π-α)cos([π/2]+α)cos([π/2]-α)】/【sin(3π-α)sin(-π-α)sin([π/2]+α)】(2)【an(2π-θ)sin(2π-θ)cos(6π-θ)】/【(-cosθ)sin(5π+θ)】11.已知tanα=-2,求sin^2α-4sinαcos
sin(α-π/4)=12/13,sinα=
2sin(α+π/3)=sinα+______