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4.1. , - () ¢, . .

¢ + () × = q (x),

() q (x) .



q (x) º 0, -


.

4.2. -

.

¢ + () × = 0,


 


= × () dx.


,

= () × () dx, () .

.

4.3. .



= u (x) × v (x),


u (x) v (x) .

¢ = u ¢ × v + u × v ¢

,

u ¢ × v + u × v ¢ + p (x) × u × v = q (x),

u ¢ × v + u (p (x) × v + v ¢) = q (x).

v (x) -

v ¢ + p (x) × v = 0,

u (x) ,

u ¢ × v = q (x).

u (x) v (x),

= u (x) × v(x).

4.4. - () ¢. :

¢ + () × = q ().

4.5.

¢ + p (x) = q (x) × n, n ¹ 0, n ¹ 1.


 


z = y 1- n


 


z ¢

1 - n


+ p (x) × z = q (x).



.


y = u (x) × v (x)







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