y =(cos^2) x - sin (3^x),求y'
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)
sin(x+y)sin(x-y)=k,求cos^2x-cos^2y
问道三角函数题已知sin(x)-sin(y)=-(2/3);cos(x)-cos(y)=(2/3);求cos(x-y)
sin^2x+cos^2y=1/2 求3sin^2x+sin^2y的最值
化简y=sin^2(x)+2sin(x)cos(x)+3cos^2(x)
求下列函数的导数:y=x-sin x/2 cos x/2 y=x^3+3^x
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
1.y=cos^4x+sin^4x 求周期 2.y=(sin2x+sin(2x+π/3))/( cos2x+cos(2x
求函数y =cos 2x +sin 2x /cos 2x -sin 2x 的最小正周期
已知函数y=(sin x+ cos x)(sin x+cos x)+2cos x*cos x ,求它的递减区间
2sin^2x+cos^2y=1,求sin^2x+cos^2y的取值范围