5.4. , , . = 0 = f (x), , :
1) 0, 0. , = 0 = 2;
2) 0 , f (x) → 0. , f (x) = 0 = 2, 0 = 2 . . → 2: f (x) = 1, f (x) = 0;
3) 0 , f (x), 0: f (x) ≠ f (x 0).
, f (x) =
0 = 0 : f (x) = 1, f (x 0) = 2.
.
0 = f (x), , . . f (x) = A 1 f (x) = A 2. :
) 1 = 2, 0 ;
) 1 ≠ 2, 0 .
│ 1 − 2│ .
0 = f (x), .
5.3. = , 0 = 2 .
5.4. f (x) = 0 = 0 , 1.
5.5. f (x) = 0 = 0 .
g (x) = 1 = 0, , .
1. .
2. ?
3. ?
4. .
5. .
6.1. = f (x). 0 Î 0 ∆ , 0 + ∆ Î . = f (x) 0 ∆ → 0 , . f (x) 0 f '(x 0), . .
f '(x 0) = = .
= f (x) Î , f '(x) , .
0
= + ∞ ( = − ∞),
|
|
, 0 f (x) ( ).
6.1. f (x) = x 2 = 0.
. 0 ∆ ,
=
f '() = =
: , f (x) 0 f (x) ( 0; f (x 0)), . .
f '(x 0) = tgφ ( 6.1).
|
. ( 0; f (x 0)) f (x) = x 2 = kx + b. k = f '(x 0) = 2 x 0. (1; −3) ( 0; 02), :
, ,
, = .
, = .
:
1. (C)' = 0, = const;
2. ()' = . ,
3. . , .
4. × . ,
5.
6.
7. (tg )' .
8. (ctg )' .
9. .
10. .
11. (arctg )' .
12. (arcctg )' .
6.2. = f (x) 0, . , .
.
= f (x) 0, :
1) ∆ = × ∆ + α(∆ )∆ , ∆ , ∆ , , ∆ , α(∆ ) ∆ → 0. , = = f '(x 0);
2) = f (x) 0.
, . , = 0 = 0, . . f (x) = = = 0 = f (x 0).
' = ()'= 0 = 0 , . . 0 = 0 .
6.3. = f (x) 0. f (x) 0
dy = f '(x 0) × ∆ x.
, . . dx = ∆ x. , = f (x) , dy 0 ( 0; f (x 0)) ( 6.2).
|
6.3. , .
. = . . ∆ = dy = y ' = . 1+ 0,00015 = 1,00015.
|
|
.
6.1. u = u (x) v = v (x) 0, , , ( , v (x 0) ≠ 0) , :
1) ;
2) ;
3) .
. u = u (x) v = v (x) 0:
1) =
=
.
2)
=
=
+ + = .
3) .
=
= .