2.1.
P () dx + Q (y) dy = 0
.
: dx , ,
dy .
ò () dx + ò Q (y) dy = c.
2.2.
¢ =
f (, y)
,
f (, y)
,
, . .
¢ =
f 1(x) × f 2 (y).
: ¢ -
dy
¢ = =
dx
f 1(x) × f 2 (y),
dx
f 2 (y).
dy =
f 2 ()
f 1(x) × dx -
.
2.3.
P (, ) dx + Q (, y) dy = 0
,
-
P (, )
Q (, y) -
, - :
1(x) P 2 (y) dx + Q 1(x) Q 2 (y) dy = 0.
:
P 1(x) dx + Q 2 (y) dy = 0,
Q 1(x)
.
P 2 ()
,
, - , , - .