xdy dx-y sinx=0解微分方程
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(一题)从这步d(ysinx)-dcos(x-y)=0到这步sinxdy+ycosxdx+sin(x-y)(dx-dy)=0不懂是么?ysinx是两个数相乘,对它d(ysinx)时就得用公式d(UV)
ysinx=cos(xy)两边分别求导y'sinx+ycosx=-sin(xy)(y+xy')y'=-y(sin(xy)+cosx)/(sinx+xsin(xy))
两边关于x求一阶导y'*e^(x+y)-y'sinx-ycosx=0y'=ycosx/(e^(x+y)-sinx)
再答:是(x+y)^2还是x+y^2再问:是前者再问:第一道题你算错了吧。再答:为啥。。。。再问:再问:这个是答案。再答:第二个你把分子分母倒一下。。。。我看看。。?再问:??再问:再问:第二道题再答
微分方程定义里,dy前面的系数就不等于0的,否则方程里只有dx,没有dy,这还是微分方程吗?
设y=y(x)由方程ysinx=cos(x-y)所确定,则y'(0)=x=0时cos(-y)=cosy=0,故y=π/2+2kπ,k∈ZF(x,y)=ysinx-cos(x-y)=0dy/dx=-(&
先计算齐次方程y'/y=tgx的通解,得到lny=lncosx+c1=ln(c2cosx),得到y=ccosx;同时根据非齐次方程的一个特解y=sinx,得到总的通解为y=ccosx+sinx
参考答案:停车坐爱枫林晚,霜叶红于二月花.
两边对x求导:dy/dxsinx+ycosx-sin(x-y)(1-dy/dx)=0,将x=π/2带入已知方程得到y,再把x、y带入上式求得结果再问:x=π/2带入已知方程得到y。。。我算不出这个y
这就是应用隐函数的求导.将x=0代入方程,得lny^2=0,得y=±1两边对x求导,得:(2x+2yy')/(x^2+y^2)=y'sinx+ycosx+1代入x=0,y=1到上式,得2y'=2,得y
通解是(ysinx+xcosx-sinx)*e^y=C再问:大神有过程吗?
ysinx-cos(x+y)=0,两边对x求导,得y'sinx+ycosx+(1+y')sin(x+y)=0,解得y'=-[ycosx+sin(x+y)]/[sinx+sin(x+y)]dy/dx=y
假设(2xcosy+y^2*cosx)dx+(2ysinx-x^2*siny)dy某个函数u(x,y)的全微分du/dx=2xcosy+y^2*cosx.(1)du/dy=2ysinx-x^2*sin
应用复合函数求导方法,y′sinx+ycosx+(1+y′)sin(x+y)=0,(sinx+sin(x+y))y′+ycosx+sin(x+y)=0,y′=-(ycosx+sin(x+y))/(si
两边对x求导y'*sinx+ycosx-[-sin(x+y)*(1+y')]=0y'(sinx+sin(x+y))=y(1-cosx)y'=[1-cosx]/[sinx+sin(x+y)]0/0所以需
y'+tanx×y=secx,一阶非齐次线性方程,套用通解公式,y=cosx(tanx+C)
(siny-ysinx)dx+(xcosy+cosx)dy=0sinydx+ydcosx+xdsiny+cosxdy=0dxsiny+dycosx=0xsiny+ycosx=C
两边求导:y'sinx+ycosx+sin(x+y)*(1+y')=0令x=0,y=π/2:π/2+1+y'=0y'=-(π/2+1)dy=-(π/2+1)dx