求下列隐函数的导数 (1)X^3-Y^3-X-Y+XY=2 (2)sin(xy)=x+y
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(1)X^3-Y^3-X-Y+XY=2
对X求导
3X^2-3Y^2*Y'-1-Y'+(1*Y+X*Y')=0
3X^2-1+Y=3Y^2*Y'+Y'-X*Y'
Y'=(3X^2+Y-1)/(3Y^2-X+1)
(2)sin(xy)=x+y
对x求导
cos(xy)*(xy)'=1+y'
cos(xy)*(1*y+x*y')=1+y'
ycos(xy)+xcos(xy)*y'=1+y'
y'=[ycos(xy)-1]/[1-xcos(xy)]
对X求导
3X^2-3Y^2*Y'-1-Y'+(1*Y+X*Y')=0
3X^2-1+Y=3Y^2*Y'+Y'-X*Y'
Y'=(3X^2+Y-1)/(3Y^2-X+1)
(2)sin(xy)=x+y
对x求导
cos(xy)*(xy)'=1+y'
cos(xy)*(1*y+x*y')=1+y'
ycos(xy)+xcos(xy)*y'=1+y'
y'=[ycos(xy)-1]/[1-xcos(xy)]
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