由方程x² y²=9所确定的隐函数y的导数为-搜答案-拍题作业网

xy+e^y=y+1（1）求d^2y/dx^2在x=0处的值：（1）两边分别对x求导：y+xy'+e^yy'=y'y/y'+x+e^y=1(2)(2)两边对x再求导一次：(y'y'-yy'')/y'^

y=x+lny两边同时求导得dy/dx=1+1/y*dy/dx(1-1/y)dy/dx=1dy/dx=1/(1-1/y)=y/(y-1)

dz=y*x^(y-1)/cosz*dx+x^y*lnx/cosz*dy

1、（1）两边对x求导得：4x³-4y³y'=-4y-4xy'解得：y'=(x³+y)/(y³-x)（2）方程化为：arctan(y/x)=(1/2)ln(x&

dy²-2d(xy)+0=02ydy-2(xdy+ydx)=02ydy-2xdy=2ydxdy/dx=y/(y-x)

y=cos(x+y)dy/dx=dcos(x+y)/d(x+y)·d(x+y)/dx,链式法则dy/dx=-sin(x+y)·(1+dy/dx)dy/dx=-sin(x+y)-sin(x+y)·dy/

y=coa(x+y)dy/dx=-sin(x+y)·(1+dy/dx)dy/dx=-sin(x+y)-sin(x+y)·dy/dx[1+sin(x+y)]dy/dx=-sin(x+y)dy/dx=-s

y''=-(2+2y^2)/y

y'=cos(x+y)(1+y')y'=cos(x+y)/(1-cos(x+y))

取对数xlny=ylnx求导lny+x*1/y*y'=y'*lnx+y*1/x(x/y-lnx)y'=y/x-lny所以dy/dx=(y/x-lny)/(x/y-lnx)

y'=-2sin2(x+y)-2y'sin2(x+y)(1+2sin2(x+y))y'=-2sin2(x+y)y'=-2sin2(x+y)/(1+2sin2(x+y))

-e^2

1、想必那个表示的是指数的意思所以4x^3dx-4y^3dy=-4ydx-4xdy,有dy/dx=(x^3+y)/(y^3-x)2、sinxdy+ycosxdx-(dx-dy)sin(x-y)=0推出

xe^f(y)=ln2009e^ye^f(y)+xe^f(y)*f'(y)*y'=y'e^f(y)(1+xf'y')=y'e^f*f'*y

设dy/dx=y'.求导,2yy'-2y-2xy'=0dy/dx=y'=y/(y-x)

e^y-e^x=xy两边求导,得e^y*y'-e^x=y+xy'(e^y-x)y'=(e^x+y)所以y'=(e^x+y)/(e^y-x)x=0时,e^y-e^0=0,则e^y=1,则y=0所以y'(

对两边取对数：xy+3lny=lncos(x-y)两边同时对x求导：y+xy'+y'*3/y=-tan(x-y)*(1-y')整理得：y'=tan(x-y)+y/tan(x-y)-x-3/y不知道对不

微分得xe^ydy+e^ydx+2ydy=0,解得dy/dx=-e^y/(xe^y+2y)

F(x,y)=x^2+y^2-ln(x+2y)Fx=2x-1/(x+2y)Fy=2y-2/(x+2y)F(x)=-Fx/Fy=-[2x(x+2y)-1]/[2y(x+2y)-2]

化为：e^(ylnx)-e^y=sin(xy)两边对x求导：e^(ylnx)(y'lnx+y/x)-y'e^y=cos(xy)(y+xy')y'[lnxe^(ylnx)-e^y-xcos(xy)]=[