已知sin(x-π/4)=-1/3,则sin2x的值等于在线等待 请帮帮忙......前辈们过程！！！

已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 已知sinα（x+π/6）=1/4,则sin（5π/6-x）+sin（π/3-x）的平方=? s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x)用matlab画图,求教啊 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知sin(x-3π/4)cos(x-π/4)=-1/4,则cosx等于 已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2 已知sin(π/4+x)sin(π/4-x)=1/6,x(π/2,π),则sin4x=? 已知sin(x+π/6)=1/3,则sin(5/6π-x)+cos2(π/3-x)=? 已知sin(x+π/3)=1/4,求sin(2π/3-x)+cos²(π/6-x) 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x) 已知 Sin(X+ 派/6)=1/4求 Sin(5/6派 - X)+Sin^2 (派/3 -X) 已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于?已知sin(π/2-x)+sin(π-x)/cos(-x)+sin(2π-x)=2009,则tan(x+5π/4)等于（） A.-2009 B.-1/2009 C.1/2009 D.2009 已知sin(x+π/6)=1/3,则sin(5π/6-x)+sin平方(π/3-x)的值是, 已知sin（x+π÷6）=1/4,则sin（5π/6-x）+cos^2（π/3-x）= 已知sin(x+6/π)=4/1,求sin(6/5π-x)+sin^2(3/π-x)的值 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin方(π/3-x)的值 已知sin(x+π/4)=3/5,sin(x-π/4)=4/5 ,则tanx= 已知cosx=3/4,则sin(5x/2)/2sin(1/2x)-1/2的值是?