高数题设 y=cos(1-2x)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
y =(cos^2) x - sin (3^x),求y'
cos(x+y)+y=1 求dy/dx
设y=cos^2(x+1),求dy
求函数y=(cos x-2)/(cos x-1)的周期,
求微分 y=ln(1-x^2) y=e^-x +cos(3+x) y=sin2x
2sin^2x+cos^2y=1,求sin^2x+cos^2y的取值范围
α+β=120°,cos α+cos β=1/2(x+y),求x+y的最大值
若方程cos(xy)-x^2·y=1 确定y是x的函数,求y''|(1,0)
证明COS(X+Y)COS(X-Y)=COS^2X-SIN^2Y
y=(1+x^4)^cos x,求dy