y=xcos(1/x)
y=xcos(1/x)
求证 cos*xcos*y + sin*xsin*y + sin*xcos*y + xin*ycos*x = 1
(2xsin(y/x)-ycos(y/x))dx+(xcos(y/x)+1)dy=0 求y
求方程[xcos(x+y)+sin(x+y)]dx+xcos(x+y)dy=0的通解,
∫xcos(1+x^2)dx=
求证:sin(x-y)sin(x+y)/sin²xcos²y=1-cot²xtan
函数y=-xcos x的函数图像怎么判断
求解微分方程 (x-ycos(y/x))dx+xcos(y/x)dx=0
求解微分方程:[x-ycos(y/x)]dx+xcos(y/x)dy=0.
设A={(x,y)|xcosα+ysinα≥1},B={(x,y)|(x,y)不属于A},则集合B表示图形的面积为?.
已知Y=sin^4*3xcos^3* 4x求Y的导数
f(x) = xcos(3x)求导