已知sin(a+π/3)+sina=-4根号3/5 -π/2

已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2 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)+sin(A-π/4)=根号2/3 1.求sinA的值 2.求【sin(A-π/4)】/【1-c 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根号下3/5,则sin(a+7π/6)=? 已知cos(a-π/6)+sina=(4*根号3)/5,则sin(a+7π/6)的值是( ) 已知sin（a＋派/3）+sina＝-(4根号3)/5,－派/2 已知sina+cosa=(3根号5)/5,a∈(0,π/4),sin(b-π/4)=3/5,b∈(π/4,π/2) （1 已知sin(a+π/3)+sina=-4√3/5,-π/2 已知tan{π/4+a}=3,求sina*sin(3π /2 +a)-sin^2a+1的值