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P. 88
b) We search the partial decision of heterogeneous Equation
in a kind:
x
*
y C ( )x C ( )x e ,
1 2
and functions C ( )x and C ( )x we search from the system of
1 1
equations
x
C ( ) 1x C ( )x e 0
1 2
x 1
C 1 ( ) 0x C 2 ( )x e x ,
1 e
from where
C 1
2 ( )x e x (1 e x )
C ( )x 1 .
1 1 e x
Then
dx
C ( )x x ln(1 e x ) ,
1 x
1 e
C ( )x e x x ln(1 e x ) .
2
Constant integration we scorn (we search the partial
decision).
Consequently:
*
y ln(1 e x ) 1 xe x e x ln(1 e x ).
x
c) the common decision of equation is:
*
x
y y x ln(1 e ) x ) 1 xe x e x ln(1 e x ) C C e
y
1 2
C 1 x e x (C x ) (1 e x ) ln(1 e x ) .
1 2
86