Cos(α-π/6)+Sinα=4√3/5,那么Sin(α+7π/6)等于多少?

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已知13sinα+5cosβ=9,13cosα+5sinβ=15,则sin(α+β)=_.9、已知cos(α-π/6)+sinα=(4√3已知13sinα+5cosβ=9,13cosα+5sinβ=15,则sin(α+β)=_.9、已知cos(α-π/6)+sinα=(4√3)/5,则sin(α+7π/6)= 已知3sinα-2cosα=0 求 sin^2α- 2sinαcosα+4cos^2α的值 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-cosα=√2/2,则sin^4α+cos^4α= 已知cos(α-π/6)+sinα=4√3/5,则sin(α+7π/6)的值是 Cos(α-π/6)+Sinα=4√3/5,那么Sin(α+7π/6)等于多少? 设角a=-35π/6,则2sin(π+α)cos(π-α)-cos(π+α)/ 1+sin^2α+sin(π-α)-cos^2(π+α)sina=sin(-35π/6)=sin(-6π+π/6)=1/2 cosα=根号3/22sin(π+α)cos(π-α)-cos(π+α)/ [1+sin^2α+sin(π-α)-cos^2(π+α)]=2(-sinα)(-cosα)+cosα/[1+sin² (sinα+cosα)(sin2α-sinαcosα+cos2α)(sinα+cosα)(sin的平方α-sinαcosα+cos的平方α)=a(1-sinαcosα)为什么? 已知sinα+sinβ=2/3且cosα+cosβ=4/3求cos(α-β)的值.谢啦. 以知sinα+sinβ=5/3,cos α-cosβ=4/5,求cos(α+β)的值 若sinα+cosβ=√2,cos-sinβ=2√2/3,则sin(α-β)= 已知sinα=2cosα,求sinα-4cosα╱5sinα+2cosα 化简:sin(π/4-α)cos(π/3-α)-cos(π/6+α)sin(π/4+α)= 若sin(α-π)=2cos(2π-α),求[sin(π-α)+5cos(2π-α)]/[3cos(π-α)-sin(-α)]的值 2(sin^6 α +cos^6α)-3(sin^4a+cos^4α)mingbaidian 2(sin^6 α +cos^6α)-3(sin^4a+cos^4α) 若tanα=-2 ,则(3sin²α+sinα cosα-2cos²α)/1+2sin²α+cos²α=_______答案;4/7 关于“同角三角比关系”的一道题(4)已知(sinα-cosα)分之(sinα+cosα)=2 ,求sinα*cosα的值答案是:3/10过程?