Problem 01 $x^3 - 3x^2y = c$
Solution 01
$3x^2~dx - 3(2xy~dx + x^2~dy) = 0$
$3x^2~dx - 6xy~dx - 3x^2~dy = 0$
Divide by 3x $x~dx - 2y~dx - x~dy = 0$
$(x - 2y)~dx - x~dy = 0$ answer
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