设xsiny+ysinx=y 求y' siny+xcosy*y'+y'*sinx+ycosx=0 为啥cosy后面还加个
微分方程(siny+y^2sinx)dx+(xcosy-2ycosx)dy=0.求详解.
求函数与微分设XsinY+YcosX=X 求Y’
dy/dx=-(2xcosy+y^2*cosx)/(2ysinx-x^2*siny)
sinx+siny+sinz=0;cosx+cosy+cosz=0;求cos(x-y)
(cosy+ycosx)dx+(sinx-siny)dy=0
1求二阶偏导数 设u=f(xcosy,xsiny),求∂^2u/∂x∂y
设cosX+cosY=1/2,sinX+sinY =1/4,求cos(X-Y)的值
设sinX+sinY=1/4,cosX+cosY=1/3,求tan(X+Y)的值.要详解.
设cosx+cosy=1/2,sinx+siny=1/4,求cos(x-y)的值
已知cosx+cosy=1/2,sinx-siny=1/3,求cos(x+y)
sinx+siny=1/4,cosx+cosy=1/3求tan(x-y)
sinx+siny=2/5,cosx+cosy=6/5,求cos(2x-2y)