已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2

已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2 已知cos(a-π/6）+sina=4根号下3/5,则sin(a+7π/6)=? 已知sin(a+π/3)+sina=-4根号3/5 -π/2 已知sin(a+π/3)+sina=-4根号3/5,-π/2 已知sin（a—π/4）=7倍根号2/10,cos2a=7/25,求sina及tan（a+π/3）的值 已知cos(a-6分之π)+sina=5分之4倍根号3,则sin(a+6分之7π)等于? 已知根号2倍的sin（a+ pei/4)=3sina,则（2sin平方a+cos平方a）/cos2a等于() 已知sin(A+π/4)+sin(A-π/4)=根号2/3 1.求sinA的值 2.求【sin(A-π/4)】/【1-c 已知；cos(a+π/6)-sina=2倍根号3/3,则sin(a-7π/6)的值为 sin(a+π/3)+sina= - 4根号3/5,则cos(a+2π/3) 已知sin(a+pie/3)+sina=-4根号3/5,-pie/2 已知cos(a-π/6)+sina=(4*根号3)/5,则sin(a+7π/6)的值是( )