已知sin（π/4+x）sin（π/4-x）=1/6,x属于（π/2,π）,求sin4x的值

sin(x+π/4) 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 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=? 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2（11π/6-x）如题, 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 已知函数f(x)=cos2x/[sin(π/4-x)] 2sin(x+π/4)sin(x-π/4)=? sin(x+π/4)sin(x-π/4)等于什么? 已知f（x）=sin(θ+x)+sin(θ-x)-2sinθ已知f（x）=sin(θ+x)+sin(θ-x)-2sinθ,对于x∈R都有f（x）≥0成立,θ∈(0,3π/2）,且tan2θ=-3/4,求cosθ的值 sin^2(π/4 +x) sin（x+π）的奇偶性sin(x+π)的奇偶性sin(x+π/2)的奇偶性sin(x+π/4)的奇偶性 已知sin(π/4+x)=12/13(π/4 已知sin(π/4--x)=5/13,0 已知sin(π/4-x)=5/13,且0 已知sin(π/4-x)=12/13,0 已知sin(x+π)=4/5,且sinxcosx 已知sin(π/4-x)=12/13,0