求sin π/12-(根号3)cos π/12

求sin π/12-(根号3)cos π/12 cosπ/12+(根号3)×sinπ/12的值 根号3×cosπ／12－sinπ／12=? sinπ/12-根号3cosπ/12的值 根号3sinπ/12+cosπ/12 sin(3π-α)=根号sinα+cosα=根号2/4.0＜α＜π,求-sinα-cosα的值…… 若sin(3π-α)=(根号2)sin(2π+β),(根号3)cos(-α)=(-根号2)cos(π+β),且0＜α＜π,0＜β＜π,求sinα,sinβ的值 cos(π/3-α)=1/8,则cosα+（根号3）sinα的值为____已知cosα-cosβ=1/2,sinα-sinβ=1/3,求cos(α+β)的值 sin π/12 -根号3cos π/12的值为：-根号2?为什么. cos(π/6+a)=根号3/3 求sin(5π/6-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) 急求已知根号3sinθ-sin(π/2-2θ)/cos(π+θ)×cosθ=1 θ ∈(0,π) 求θ的值 已知5根号3sinα+5cosα=6根号2sinβ+根号6cosβ=1,且α∈(0,π/3),β∈(π/6,π/2),求cos(α+β)的值 根号[1-2sin(3-π)cos(3-π)]化简 已知sin(3π-a)=根号2 sin（π-b）,根号3 cos（-a）=-根号2 cos（π+b）,且0＜a＜π 0＜b＜π求sin a cosa 根号3sin(π/6-a)-cos(π/6-a) cosπ/6+根号3sinπ/6=? 已知sin(π-α)-cos(π+α)=根号2分之4,求sin(π+α)+cos(3π-α)的值