已知sin(π/4-x)=5/13,x属于(0,π/4),求(cos2x)/cos[(π/4)+x]谢啦,急用

已知sin(π/4--x)=5/13,0 已知sin(π/4-x)=5/13,且0 已知sin(x+π/6)=1/4,求sin(5π/6-x)+sin^2(π/3-x) 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知-π/2＜x＜0,sin x+cos x=1/5求sin 2x+2 sin 已知sin(π/4+x)=12/13(π/4 已知sin(π/4-x)=12/13,0 已知sin(π/4-x)=12/13,0 已知sin(x+π)=4/5,且sinxcosx 已知sin(TT/4+x)=5/13,0 已知函数f(x)=cos2x/[sin(π/4-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0《x《π/4,sin（π/4-x）=5/13,求cos2x/cos（π/4+x） 已知cos(x+π/4)=5/13 .且x属于第一象限角.求cos2x/sin(π/4-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sinα（x+π/6）=1/4,则sin（5π/6-x）+sin（π/3-x）的平方=? 已知sin(x+6/π)=4/1,求sin(6/5π-x)+sin^2(3/π-x)的值