已知sin(5π/4-x)=3/5,则sin2x=?

已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) S (sin 5x) (sin 3x) dx = 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sinα（x+π/6）=1/4,则sin（5π/6-x）+sin（π/3-x）的平方=? 已知sin(x+π/4)=3/5,sin(x-π/4)=4/5 ,则tanx= 已知sin(x-4/π)=3/5,则sin2x=已知答案等于7/25 已知sin(x+π/6)=1/3,则sin(5/6π-x)+cos2(π/3-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+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+y)=1/3,sin(x-y)=1/5,则tanx/tany 已知sin（x+π÷6）=1/4,则sin（5π/6-x）+cos^2（π/3-x）= 已知cosx=3/4,则sin(5x/2)/2sin(1/2x)-1/2的值是? 已知sin[a-b]cos a-cos[b-a]sin a=3/5,b是第三象限角,求sin[b+5π/4]的值第一题1/2cos x-√3/2sin x第二题√3sin x+cos x第三题√2[sin x-cos x]第四题√2cos x-√6sin x 已知sin(5π/4-x)=3/5,则sin2x=?