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Kreysig ַ

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ڷἳ
Kreysig Դϴ.
/
1 1 ̹
y = g(u)

y= u + xu
u + xu= g(u)
u Ǯ
M(x,y)dx + N(x,y)dy = 0
u(x,y)=c
:
k u = c
P(x,y)dx + Q(x,y)dy = 0
F(x)
y+ p(x)y = r(x)
y+ p(x)y = g(x)ya ̹
u = y1-a
u ؼ
2 2 ̹
y+ ay+ by = 0
idea y=ex & 2+a+b=0
DZ
߱ (=-a/2)

(=᡾i )
߱ y2=uy1
y2=uy1+uy1
y2=uy1+2uy1+uy1
(uy1+2uy1+uy1)+a(uy1+uy1)+buy1=0
uy1+u(2y1+ay1)+u(y1+ay1+by1)=0
uy1=0
u=0
u=c1x+c2
y=(c1+c2x)ex
y=c1e+i+c2e-i
eix=cosx+isinx
y=ex[(c1+c2)cosx+i(c1-c2)sinx]
=ex(Acosx+Bsinx)
x2y+ axy+ by = 0 ()



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