6sin^2α-sinαcosα-cos^2α=0,求cosα+sinα的值

sinα-2cosα分之sinα+cosα 3sinα=2cosα,则 cosα-sinα/cosα+sinα/ cos3sinα=2cosα,则cosα-sinα/cosα+sinα/cosα+sinα/cosα-sinα sin(α+β)-2cosαsinβ/2cosαcosβ-cos(α+β) 6sin^2α-sinαcosα-cos^2α=0,求cosα+sinα的值 sin(α+β)-2sinαcosβ/2sinαsinβ+cos(α+β) (1-cos-sin)(1-sin+cos)/sin^2α-sinα 化简sinα^6+cosα^6+3sinα^2cosα^2的结果是 化简：sin^6α+cos^6α+3sin^2α*cos^2α=? 2(sin^6 α +cos^6α)-3(sin^4a+cos^4α)mingbaidian 2(sin^6 α +cos^6α)-3(sin^4a+cos^4α) 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 sinα=-2cosα,求sin^2α-3sinαcosα+1 求证:sinα/(1+cosα)+(1+cosα)/sinα=2/sinα 若sinα+sin^2α=1,则cos^2α+cos^6α+cos^8α=? sin α+sin^2α=1,则cos^2 α+cos^6 α+cos^8α=多少?, 若sinα+sin^2α=1,则cos^2α+cos^4α+cos^6α=? sinαsinα+cosαcosα= sin αcosβ＋cos α sin β等于?