若sin(π/6-a)=根号3/3,则sin(7π/6-a)=
若sin(π/6-a)=根号3/3,则sin(7π/6-a)=
求证 cos(A)+ 根号3sin(A)=2sin(π/6+A)
已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?
已知sin(a+π/6)+cosa=4/5倍根号3,则sin(a+π/3)=
已知sin(π/6-a)=根号3/3,则 cos(4π/3+a)
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
已知向量a=sin((a+π/6),1),b=(4,4cosa-根号3) a垂直b 则sin(a+4π/3)的值
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(阿尔法+π/3)=a,那么根号3sin阿尔法-cos阿尔法的值
若sin(π+a)=1/根号10 则【sin(-a)+sin(-a-90°)】/【cos(540°-a)-cos(-a-
(1)已知cos[(π/3)-a]=根号3/3,求sin[5π/6)-a]+sin^2[(2π/3)+a]的值