已知sin(π/4--x)=5/13,0

已知sin[(π/4)-x)]=5/13,0 已知sin(π/4-x)=12/13,0 已知sin(TT/4+x)=5/13,0 已知cos(π/4+x)=5/13,0＜x＜π/4,求sin(π/4-x)/cos2x 已知sin(π/4-x)=5/13,x属于(0,π/4),求(cos2x)/cos[(π/4)+x] 已知sin(π/3-x)=-1/5,且0 已知sin(pi/4-x)=3/13(0 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/4)-x)]=5/13,0<x<π/4.求cos2x/(cosπ/4+ 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,则sin(7π+x)+sin^2(5π/6-x)的值 已知sin(x+π/6)=1/3,求sin(5π/6-x)+sin^2(π/3-x)