当cos^2x-cos^2y=√3/2时,求sin(x+y）×sin(x-y)

当cos^2x-cos^2y=√3/2时,求sin(x+y）×sin(x-y) 证明COS（X+Y）COS（X-Y）=COS^2X-SIN^2Y 证明cos(x+y)cos(x-y)= cos^2(x)-sin^2(y) y=2cos x (sin x+cos x) Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) y=(cos x-2)/(cos x-1)的值域 证明cos 2x cos x=1/2(cos x+cos 3x) y=cos^2 x-cos x +1的值域y=cos^2 x+cos x +1的值域, y=cos(π/3-x)cos[π/2（x-1)]判断奇偶性y=cos(π/3-x)cos(π/3+x)判断奇偶性 求函数y=√3cos(3π/2+2x)+cos^2x-sin^2x的周期,当x取何值时,y取最大值,最小值 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 【高中数学】已知cos(x+y)=1/3,cos(x-y)=2/3,且0 已知cos(x+y)=1/3,cos(x-y)+2/3,且0 y=(sin x + COS x)^2 y =(cos^2) x - sin (3^x),求y' y=4√2sin x cos x+cos 2x 的值域是 已知函数y=1/2cos²x+√3/2sinxcosx+1,x∈R.当函数y取得最大值时,求自变量x的集合 2cos(x+y)cosx-cos(2x+y)化简