For example: +1=0 3y2+4y-x+3=0 +2xy=x (2x+y)+xd小y=0 d e 2 +2 dx +(sin x)2+5xy=0 dx 2 3+324)+y3(4)2=5xFor example: 1 0 ( ) + = n y 3 4 3 0 2 y + y − x + = 2 2xy x dx dy + = (2x + y)dx + xdy = 0 2( ) 1 2 2 2 + = dx dy dx d y e y 4 (sin ) 5 0 2 2 3 3 + + xy = dx d y x dx d y x dx dy y dx dy y dx d y ( ) 3 ( ) ( ) 5 3 7 3 2 2 2 + + =