已知sin(π/4 + α)*sin(π/4 - α)=1/6,α属于(1/2*π,π),求sin4α的值
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已知sin(π+θ)
已知sin(3π-α)=-2sin(π/2+α)则sinαcosα
已知sin(α+π/3)+sinα=-4√3/5(-π/2
已知sinα=﹣4/5,求√2 sin(α+π/4)的值
已知sinα=-0.4,求下列三角函数值 sin(-α) sin(3π-α) sin(α-π) sin(α-10π)
已知sin=1/4,π/2
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sin(α+π/4)=3/5,π/2
已知-π/6≤β≤<π/4,3sin²α-2sin²β=2sinα,求sin²β-½sinα的最小值
已知-π/6<=β<π/4,3sin^2α-2sin^2β=2sinα,求sin^2β-1/2sin^2α的最值.
已知β∈[-π/6,π/4),且3(sinα)^2-2(sinβ)^2=2sinα,求(sinβ)^2-1/2sinα的最小值
已知sin(π/4-α)=5/13,0
已知sin(π/4-α)=5/13,0
已知sinα =4/5,π/2
已知sin((π/4)-α)=5/13,(0
已知sin(45度-α)=-2/3,π/4
已知sin=-4/5,π<α
sin(α-π/4)=12/13,sinα=