已知3sin^2x+2sin^2y=2sinx,则sin^2x+xin^2y的取值范围是

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) 3sin^2x+-2sin^2y=2sinx sin^2x+-sin^2y=? s = 2*sin(x)-sin(2*x)+2/3*sin(3*x)-1/2*sin(4*x)+2/5*sin(5*x)用matlab画图,求教啊 已知sin(x+y)=2/3,sin(x-y)=2/5,则tanx/tany的值是多少? y=[sin^2(x)]*[sin^2(x)]求导 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)=1/2,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 已知tan=2,求(cos x+sin x)/(cos x-sin x)+sin^2x 已知3sin^2x+2sin^2y=2sinx,则sin^2x+xin^2y的取值范围是 已知sin(x)+3cos(x)=2,求sin(x)-cos(x)/sin(x)+cos(x)=? 已知sinx=3/5,x∈(π/2,π),求【sin(x+y)+sin(x-y)】/【cos（x+y）+cos（x-y）】的值 求y=sin[sin(x^2)]的导数 已知函数f(x) =√3cos(2x-y)-sin(2x-y) (0 已知函数y=-sin^2x+sinx(-π/2 已知函数y=2sin(2x+φ)(|φ|