y=cos(x^2-2x+2)+(-x)^2,求y的导函数

y=2cos x (sin x+cos x) y=(sin x + COS x)^2 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=(cos x-2)/(cos x-1)的值域 y=cos^2 x-cos x +1的值域y=cos^2 x+cos x +1的值域, 求导：y=x-sin(x/2)cos(x/2). sin(x+y)sin(x-y)=k,求cos^2x-cos^2y 化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x) 2cos(x+y)cosx-cos(2x+y)化简 y =(cos^2) x - sin (3^x),求y' Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y) y=2cos^2 x+sinx y=cos*2(X/2) 周期 y=cos*2(X/2) 周期 y=sinxcosx+cos(2x)化简 y=(cos^2x) 求dy 已知函数y=(sin x+ cos x)(sin x+cos x)+2cos x*cos x ,求它的递减区间语气亲和、态度友好