若sin(π/6-α)=根号3/3,则,sin(7π/6-α)=
若sin(π/6-a)=根号3/3,则sin(7π/6-a)=
已知cos(α-π/6)+sinα=4/5 根号3,则sin(α+7/6π)=?
已知cos(α-π/6)+sinα=(4倍根号3)/5,则sin(α+7π/6)=
sin(3π-α)=根号
已知向量a=(sin(α+π/6),1),b=(4,4cosα-根号3),若a⊥b,则sin(α+4π/3)等于
数学三角函数题已知cos(α‐π/6)+sinα=4/5根号3则sin(α+7/6π〕的值是多少
已知sin(π+α)=根号3/2,求sin(3/4π-α)
已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
已知cos(α-π/6)+sinα=4根号3/5,求sin(α+7π/6)的值
cosπ/6+根号3sinπ/6=?
已知sin(a+π/6)+cosa=4/5倍根号3,则sin(a+π/3)=