GIA'I PHU.O.NG TRNH
93)
Gia'i phu.o.ng trnh:
2xylnydx+ (x2
+y2
py2
+ 1)dy= 0HD gia’i:D - ^ay la phu.o.ng trnh vi ph^an toan ph^an, thu.a s^o tch ph^an:
µ(y) = 1ynh^an
thu.a s^o tch ph^an vao hai v^e cu'a phu.o.ng trnh r^oi gia'i ra du.o..c:
x2
lny+13(y2
+1)3
2
= 0