高数,,, 20
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ln√(x^2+y^2) = arctan(y/x)
(1/2)ln(x^2+y^2) = arctan(y/x)
两边求导
(x+ydy/dx)/(x^2+y^2) = (1/[1+(y/x)^2 ]) [ -y/x^2 + (1/x).dy/dx ]
= [x^2/(x^2+y^2)] [ -y/x^2 + (1/x).dy/dx ]
= [1/(x^2+y^2)] [ -y + x.dy/dx ]
x+ydy/dx =-y + x.dy/dx
(x-y).dy/dx =x+y
dy/dx =(x+y)/(x-y)
(1/2)ln(x^2+y^2) = arctan(y/x)
两边求导
(x+ydy/dx)/(x^2+y^2) = (1/[1+(y/x)^2 ]) [ -y/x^2 + (1/x).dy/dx ]
= [x^2/(x^2+y^2)] [ -y/x^2 + (1/x).dy/dx ]
= [1/(x^2+y^2)] [ -y + x.dy/dx ]
x+ydy/dx =-y + x.dy/dx
(x-y).dy/dx =x+y
dy/dx =(x+y)/(x-y)
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