有定义运算x*y=x^2-y^2+2x,则cos(x/3)*sin(x/3)=
y =(cos^2) x - sin (3^x),求y'
化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)
Sin x-sin y=2/3 cos x-cos y=1/2 求cos(x-y)
sin(x+y)sin(x-y)=k,求cos^2x-cos^2y
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
求下列函数的导数:y=x-sin x/2 cos x/2 y=x^3+3^x
y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)的最值 用向量解
y=sin^2x-3sinxcosx+4cos^2x是否等于y=sin^2x+cos^2x+3cos^2x-3/2*si
设sin(x+y)sin(x-y)=m,则cos^2x-cos^2y的值
已知函数y=4 cos²x+4倍根号3 sin x cos x-2,x∈R.
已知函数y=sin(x/2)+根号3*cos(x/2),x属于R
已知cos^2x-cos^2y=根号3/2,则sin(x+y)·sin(x-y)的值