已知sin(a+π/6)+cosa=4/5倍根号3,则sin(a+π/3)=
已知sin(a+π/6)+cosa=4/5倍根号3,则sin(a+π/3)=
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
在三角形abc中,根号3倍SIN(π/2-A)=3sin(π-A)且cosA=-根号3倍cos(π-B),则C=
已知sin(a+π/6)=4/5 a∈(0,π/3) 求cosa
已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2
sin(a-B)cosa-1/2[sin(2a+B)-sinB]=?已知cos(a-π/6)+sina=4√3/5则si
已知sina/cosa=-2,则sin(a-3π)+cos(π-a)/sin(-a)-cos(π+a)
若sinA+cosA/sinA-cosA=2,则sin(A-5π)*sin(3π/2-A)等于?
已知sina-cosa=-根号3/2,则sin a*cos a=
化简:sin(a-B)cosa-1/2[sin(2a+B)-sinB]=?已知cos(a-π/6)+sina=4√3/5
已知cos(α-π/6)+sinα=(4倍根号3)/5,则sin(α+7π/6)=
已知sin(π/6+a)=(根号3)/3,求sin(2π/3+a)?