求证:(根号3)*sinα+cosα=2sin(α+π/6)
若θ,α为锐角,且tanθ=(sinα-cosα)/(sinα+cosα)求证sinα-cosα=根号2sinθ
若α β是锐角tanβ=sinα -cosα / sinα + cosα 求证sinα -cosα=根号2sinβ
当α β是锐角tanθ=sinα -cosα / sinα + cosα 求证sinα -cosα=根号2sinθ
求证cos(3π/2+α)=sinα
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
已知cos(6/π-α)=三分之根号三,求证:sin(4π/3+α)+cos的平方(2π/3-α)=.(2-根号3)/3
1.化简根号2cos x - 根号6sin x2.已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第
求证sin^2α+cosαcos(π/3+α)-sin^(π/6-α)的值与α无关
2sinα-cosα=根号3sinα,则cosα
求证sin^2α+sin^2β-sin^2αsin^2β+cos^2cos^2β=1
1.已知cos(π/6-α)=1/3,求sin(2/3π-α) 2.求证tan^2α-sin^2α=tan^2α-sin
求证(1+sinα+cosα+2sincosα)/(1+sinα+cosα)=sinα+cosα