知sin(3π-α)=根号2 sin(π-β),根号3 cos(-α)= - 根号2 cos(π+β) 且0

已知sin(π-α)+sin(5π/2+α)=根号2/3(π/2 sin(α+4/π)+sin(α-4/π)=3/根号下2 求证:(根号3)*sinα+cosα=2sin(α+π/6) 化简sin(α+β)+sin(α-β)+2sinαsin(3π/2-β)= 知sin(3π-α)=根号2 sin(π-β),根号3 cos(-α)= - 根号2 cos(π+β) 且0 若sin(3π-α)=根号2sin(2π+β)已知sin(3π-α)=根号2 sin(π-β),根号3 cos(-α)= - 根号2 cos(π+β) 且0 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 若sin(π/6-α)=根号3/3,则,sin(7π/6-α)= cos2α/[sin(α-π/4)]=-根号2 /2,cosα+sinα=? 已知sin(π/6+a)=（根号3）/3,求sin(2π/3+a)? 已知函数f(x)=2根号3sin平方x-sin（2x-π/3) 求证 cos（A）+ 根号3sin(A)=2sin(π/6+A) 已知α∈(π/2,π),sin(-α-π)=根号5/5,则sin(α-3/2π)= 已知sin(π+α)=根号3/2,求sin(3/4π-α)还有一题急.在线等,给分 已知sin（α+π/3）+sinα = — 4根号3/5,— π/2第三题 cos(π/2-α)=根号2cos(3/2π+β),根号3sin(3π/2-α)=-根号2sin(π/2+β)且0 若sin(3π-2)=根号2sin(2π+β),根号3cos(-α)=-根号2cos(π+β)0