已知sin(x+y)=1/2,sin(x-y)=1/3,求tanx,tany要不然我是看不懂的

已知sinx=1/3,sin(x+y)=1,则sin（2y+x)= 已知(sinx)2-(siny)2=m求sin(x y)sin(x-y)求sin(x+y)sin(x-y) 已知Sin x+Sin y=1/2,Cos x+Cos y=根号3/3,求S求Sin(x-y)/2 已知sin(x+y)=1/3,sin(x-y)=1/5,则tanx/tany 已知sin(x+y)=1/2,sin(x-y)=1/3,求tanx,tany要不然我是看不懂的 已知sin(X+Y)=2/3,sin(X-Y)=1/5,求(tanX)/(tanY)的值 y =sin(2x-1)求导! 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 已知x,y,z属于(0,派/2),sin^2x+sin^2y+sin^2z=1,求(sinx+siny+sinz)/(cosx+cosy+cosz)的最大值 y=[sin^2(x)]*[sin^2(x)]求导 已知-π/2＜x＜0,sin x+cos x=1/5求sin 2x+2 sin 已知函数f(x)=(1+1 anx)sin^2x+m sin(x+π/4)sin(x-π/4) 已知cos(x-y/2)=-1/9,sin(x/2-y)=2/3,0 已知cos(x-y/2)=-1/9,sin(x/2-y)=2/3,0 一道三角恒等式证明题请证明sin(x+y)sin(x-y)=sin^2(x)-sin^2(y) 已知sin（x+y）=1,求证：tan（2x+3y）=tany 已知x+y+z=π,证明sin(x+y)+sin(y+z)+sin(z+x)≥sin2x+sin2y+sin2z y=(sin x + COS x)^2