Differential- integral factor by inspection

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    Differential Integral
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The discussion focuses on finding integral factors by inspection for two differential equations: 1) y(2 - 3xy)dx - xdy = 0 and 2) y(x^2+y^2-1)dx + x(x^2+y^2+1)dy = 0. Participants emphasize the importance of recognizing common forms and examples, such as d(xy) = x dy + y dx and d(arctan(y/x)) = x dy - y dx, to facilitate the identification of integrating factors. The conversation highlights the necessity of practice in recognizing these patterns to solve differential equations effectively.

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Nickclark
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i'm trying to solve the problem by finding the integral factor by inspection:

1) y(2 - 3xy)dx - xdy =0
2) y(x^2+y^2-1)dx + x(x^2+y^2+1)dy=0

i can't solve those two questions! Help please.

Thanks in advance
 
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What have you tried? When guessing integrating factors it helps to factor and keep in mind common examples such as
d(xy)=x dy+y dx
y2 d(x/y)=y dx-x dy
x2 d(y/x)=x dy-y dx
(x2+y2) d(arctan(y/x))=x dy-y dx
[tex]x^{1-p}y^{1-q}{d}(x^py^q)=pydx+qxdy[/tex]
and so on
 

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