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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(x²+y²)
两边对x求导得:(y/x)'/[1+(y/x)²]=(x+yy')/(x²+y²)
即:[(xy'-y)/x²]/[1+(y/x)²]=(x+yy')/(x²+y²)
即:(xy'-y)/(x²+y²)=(x+yy')/(x²+y²)
得:xy'-y=x+yy'
解得:y'=(x+y)/(x-y)
2、两边对x求导得:3x²+3y+3xy'+3y²y'=0
消去3,将x=1,y=1代入得:1+1+y'+y'=0,解得:y'=-1
切线方程:y-1=-(x-1),即:y=-x+2
法线方程:y-1=x-1,即:y=x
4x³-4y³y'=-4y-4xy'
解得:y'=(x³+y)/(y³-x)
(2)方程化为:arctan(y/x)=(1/2)ln(x²+y²)
两边对x求导得:(y/x)'/[1+(y/x)²]=(x+yy')/(x²+y²)
即:[(xy'-y)/x²]/[1+(y/x)²]=(x+yy')/(x²+y²)
即:(xy'-y)/(x²+y²)=(x+yy')/(x²+y²)
得:xy'-y=x+yy'
解得:y'=(x+y)/(x-y)
2、两边对x求导得:3x²+3y+3xy'+3y²y'=0
消去3,将x=1,y=1代入得:1+1+y'+y'=0,解得:y'=-1
切线方程:y-1=-(x-1),即:y=-x+2
法线方程:y-1=x-1,即:y=x
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