已知sin(a+π/3)+sina=-4√3/5,-π/2
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已知sin(a+π/3)+sina=-4√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
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
已知tan{π/4+a}=3,求sina*sin(3π /2 +a)-sin^2a+1的值
已知sin(π+a)=1/3,则sina=
已知sin(2π-a)=4/5,a∈(3/2π,2π),则(sina+cosa)/(sina-cosa)等于
已知sina=3/5,则sin(π/2+2a)的值为
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