求方程y²+x3y=2x所确定的隐函数y=y(x)的二阶导数
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左右对x求导有y'/y=sec²(xy)(y+xy')整理有y'=y²/(cos(xy)-xy)所以dy=(y²/(cos(xy)-xy))dx
隐函数求导设z=x²y²-cos(xy)dy/dx=-(δz/δx)/(δz/δy)=-(2xy²+ysin(xy))/(2x²y+xsin(xy))=-y/x
-sin(xy)[ydx+xdy]=2xy^2*dx+x^2*2ydy-sin(xy)ydx-sin(xy)xdy=2xy^2*dx+2x^2*ydy-2x^2*ydy-sin(xy)xdy=2xy^
第一题,这是个隐函数,两边对x求导得:2y'-1=(1-y')*ln(x-y)+(x-y)*(1-y')/(x-y)=(1-y')*ln(x-y)+(1-y')所以[3+ln(x-y)]y'=ln(x
两边对x求导:2cos(x^2+y)*(-sin(x^2+y))*(2x+y')=1所以y'=-1/sin(2x^2+2y)-2x再问:求f'(x)```再答:y'就是f'(x)啊。。。。。
方程两边对x求导得2x+y′x2+y=3x2y+x3y′+cosxy′=2x−(x2+y)(3x2y+cosx)x5+x3y−1由原方程知,x=0时y=1,代入上式得y′|x=0=dydx|x=0=1
中间的2X^2Y,是说2X的2Y次方吗?还是打错了,2x*2y呢,再问:是2X的2次方乘以Y再答:恩,这种题的做法都是左右两边同时求导。右边对X求导得到3x^2+2*2xy+2x^2dy/dx-3y-
对y^2-2xy=7求微分,得2ydy-2(ydx+xdy)=0,∴(y-x)dy=ydx,∴dy/dx=y/(y-x).
y'=-2sin2(x+y)-2y'sin2(x+y)(1+2sin2(x+y))y'=-2sin2(x+y)y'=-2sin2(x+y)/(1+2sin2(x+y))
两边求导e^y×y'=xy'+yy'=y/(e^y-x)dy/dx=y/(e^y-x)
将y看作是x的函数,则对x求导数有:3y^2*y'-3y'+2=0求出y'=2/3(1-y^2)其中y^2,y^3表示幂函数
看书看书,都是没认真看书闹的,书上写得明明白白清清楚楚,举手之劳,翻翻书就有了.这是一个学习习惯的问题,你看给自己造成多大的困扰. 以上解法是先令 F(x,y)=(1/2)ln[(x^2)+(
设dy/dx=y'.求导,2yy'-2y-2xy'=0dy/dx=y'=y/(y-x)
两边对x求导,则2x-[e^y+x(e^y)y']=0整理得y'=(2x-e^y)/(xe^y)
第一步方程两边对x求导记y+xy'-y'/y=2x第二步解出y'记y'=(2xy-y^2)/(xy-1)
微分得xe^ydy+e^ydx+2ydy=0,解得dy/dx=-e^y/(xe^y+2y)
x3y+xy3=xy(x^2+y^2)=(√3-√2)(√3+√2)((√3-√2)^2)+(√3-√2)^2)=1*(3-2√6+2+3+2√6+2)=10
xy+sin(x+y)=1,两边求导数y+xy'+cos(x+y)*(1+y')=0xy'+cos(x+y)y'=-[cos(x+y)+y]∴y'[cos(x+y)+x]=-[cos(x+y)+y]∴
∵x-y=l,xy=2,∴x3y-2x2y2+xy3=xy(x2-2xy+y2)=xy(x-y)2=2×1=2.