已知sin(a+60°)+sina=-4√3/5,-90°
已知sin(a+60°)+sina=-4√3/5,-90°
已知sin(a+60)+sina=-(4根3)/5,-90
已知sin(a+π/3)+sina=-4√3/5,-π/2
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
已知sin(45°-a)=-2/3,45°<a<90°,则sina等于多少
已知cos(a-π/6)+sina=4√3/5,则sin(a+7π/6)=?
已知cos(a-π/6)+sina=4√3/5,求sin(a+7π/6)的值为
已知cos(a-pai/6)+sina=4√3/5,则sin(a+7/6pai)的值是?
已知sin=-3/5,那么(cosa+sina/cosa-sina)+(cosa-sina/cosa+sina)
化简:sin(a-B)cosa-1/2[sin(2a+B)-sinB]=?已知cos(a-π/6)+sina=4√3/5
sin(a-B)cosa-1/2[sin(2a+B)-sinB]=?已知cos(a-π/6)+sina=4√3/5则si
(1)已知:sina+cosb=3/4,cosa+sinb=-5/4,求sin(a+b).