设y=sin(x y),求dy dx
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1)y|x=o当x=0时sin(0)-1/y-0=1得:y|x=0=-1(2)y'|x=osin(xy)-1/y-x=1两边对x求导:cos(xy)(y+xy')+y'/y^2-1=0当x=0时y=-
是把y看作关于x的函数.再问:不是很懂,给个步骤吧。谢谢。再答:1/y-x是(1/y)-x的意思,还是1/(y-x)?再问:1/(y-x)再答:把y看做x的复合函数,两边对x求导,得cos(xy)·(
xy-12=4x+y≥2√(4xy)=4√(xy)xy-4√(xy)-12≥0(√(xy)-6)(√(xy)+2)≥0√(xy)≤-2,√(xy)≥6因为√(xy)≥0所以√(xy)≥6xy≥36所以
y=sinx²+sin²x∴y'=cos(x²)*(x²)'+2sinx*(sinx)'=2x*cos(x²)+2sinxcosx=2x*cos(x&
再答:隐函数高阶求导。再答:
e^(xy)+sin(xy)=y(y+xy')e^(xy)+(y+xy')cos(xy)=y'y'=(ye^(xy)+ycos(xy))/(1-xe^(xy)-xcos(xy))
这个题目要利用隐函数的求导法则.则sin(x^2+y)=xy(两边同时求导,还要结合复合函数的求导法则)cos(x^2+y)*(2x+y′)=y+xy′2xcos(x^2+y)-y=xy′-y′cos
设函数f(x,y)=sin(x+y),那么f(0,xy)=(sinxy)应该是sin0+sinsy=0+sinxy=sinxy再问:limsinxy\2x=()补充x→0,y→3另外一道题
cos(x+y)(1+y')=y+xy'dy/dx=y'=[y-cos(x+y)]/[cos(x+y)-x]
Fx=e^x-y^2Fy=cosy-2xydy/dx=-Fx/Fy=(y^2-e^x)/(cosy-2xy)
等式两边对x求导:cos(xy)*(y+x*y')-(2x*2y+x^2*2*y'=0解出y'即为所求
y+xy'-cos(πy²)2πyy'=0y=[2πycos(πy²)-x]y'y'=y/[2πycos(πy²)-x]即:dy/dx=y/[2πycos(πy²
∵siny+e^x-xy^2=0,∴(dy/dx)cosy+e^x-[y^2+2xy(dy/dx)]=0,∴(cosy-2xy)(dy/dx)=y^2-e^x,∴dy/dx=(y^2-e^x)/(co
这是隐函数.二阶导再导一次就是.方程两边对x求导,得z'=cos(xz)(xz)'+y(y不是关于x的函数吧?)=zcos(xz)+xz'cos(xz)+y所以z'=[zcos(xz)+y]/[1-x
在方程中令x=0可得,0=lney(0)+1,从而可得,y(0)=e2将方程两边对x求导数,得:cos(xy)(y+xy′)=1x+e−y′y将x=0,y(0)=e2代入,有e2=1e−y′(0)e2
dy/dx=-fx/fy,你自己可以算吧
e^(x+y)+sin(xy)=1e^(x+y)*(1+y')+cos(xy)(y+xy')=0y'*[e*(x+y)+xcos(xy)]=-[ycos(xy)+e^(x+y)]y'=-[ycos(x
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)]=[