化简cos^4角+sin^2角cos^2角+sin^2角

化简cos^4角+sin^2角cos^2角+sin^2角 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 sin^4+sin^2cos^2+cos^2a= 已知α为第二象限角,化简cosα√（1-sinα/1+sinα)+sinα√(1-cosα/1+cosα)求证：1+sinα+cosα+2sinαcosα/1+sinα+cosα=sinα+cosα 化简sin^4x+cos^2x sin^2cos^2化简 化简(sin^2x-cos^4x+cos^2x-sin^4x)/(sin^2x-cos^6x+cos^2x-sin^6x) 化简 1-sin^4a-cos^4a/cos^2a-cos^4a 化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)== 1.化简根号2cos x - 根号6sin x2.已知sin(α-β)cosα-cos(β-α)sinα=3/5,β是第三象限角,求sin(β+5π/4)的值.3.化简sin(α-β)sin(β-λ)-cos(α-β)cos(λ-β) 化简：1+sinθ+cosθ+2sinθcosθ /1+sinθ+cosθ 已知sin[a-b]cos a-cos[b-a]sin a=3/5,b是第三象限角,求sin[b+5π/4]的值第一题1/2cos x-√3/2sin x第二题√3sin x+cos x第三题√2[sin x-cos x]第四题√2cos x-√6sin x 对于任意角α,cos^4α-sin^4α=(cos^2α+sin^2α)(cos^2α-sin^2α)=cos^2α-sin^2α=cos2α.中应用了? 2sin@+cos@等于? 化简sin^4x-sin^2x+cos^2x 化简:sin^4 x-sin^2 x+cos^2 x 化简sin^4α+cos^4α+2sin^2α*cos^2α-1 化简sin^4α+cos^2α+sin^2α*cos^2α