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)]=5/13,0 已知函数fx=（1+1/tanx）sin^x-2sin（x+π/4)sin（x-π/4） 已知函数f(x)=cos2x/[sin(π/4-x)] 1.已知sin(π/6-x)=1/4,sin(π/6+2x)=? 已知函数y=2sin(2x-π/4)-2根号2sin^2x 已知f(x)=cos^2x+sinxcosx g(x)=2sin(x+π/4)sin(x-π/4) 已知函数f(x)=sin^2 x+2根号3sinxcosx+sin(x+π/4)sin(x-π/4),x属于R,求f(x 三角函数 已知sin(π/4+x)=12/13(π/4 已知函数f(x)=cos(2x-π/3)+2sin(x-π/4)sin(x+π/4) 已知函数f(x)=(1+1/tanx)sin(x)^2 -2sin(x+π/4)*cos(x+π/4) 已知函数f(x)=sin^2*x-根号3*sinπ/4*x*cosπ/4*x