.
6.2. = φ(t) t 0, = f (x) 0 = φ(t 0), f (φ(t)) t 0,
'(t 0) = f '(x 0) × φ'(t 0).
6.4. ', = .
. = , . 6.2 '() = '() × '() = ()' × ()' = = × = × .
6.1. 6.2 , t . . .
6.5. = tg2( 2+1).
. = 2, = tg , = 2+1.
'() = '() × '() × '() = ( 2)' × (tg )' × ( 2+1)' = = tg .
, f '() = f (x) . , .
6.4 n -
6.4. f '() = f (x), (). f '() = f (x) f ''(x). f ' '(x) , f '''(x). n - n. , , : '', ''', (4), (5),, ( n ),. ,
( n ) = ( ( n 1))', n = 2, 3, .
6.6. = .
. 1) ' = ;
2) '' = ( ')' =
= ;
3) ''' = ( '')' = ()' = = .
6.5. = f (x) . dy = f '(x) dx = f (x). (, . .)
dny = f (n)(x)(dx) n, n = 2, 3,.
6.7. d 2 y, = 4 − 3 2 + 4.
. 1) dy = ( 4 − 3 2 + 4)' dx = (4 3 6 ) dx;
2) d 2 y = (4 x 3 6 x)'(dx) = (12 x 2 6)(dx)2.
1. .
2. ?
3. ?
4. ?
5. .
6. ?
7. ?
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7.1. f (x) () 0 . , 0 , , . . f ¢(x) = 0.
. 0 f (x) , . . Î () f (x) £ f (x 0). , ∆ = f (x 0 + ∆ x) f (x 0) £ 0 ∆ . :
1) ∆ > 0. £ 0 , ,
= £ 0;
2) ∆ < 0. ³ 0 , ,
= ³ 0.
, f ¢(x) , . ,
0 £ = = £ 0.
= 0, . . f ¢(x) = 0.
, 0 f (x) .
7.2. [ ] f (x), : 1) f (x) [ ]; 2) f (x) (); 3) f () = f (). Î(), f ¢() = 0.
. f (x) [ ], m, . . 1, 2 Î [ ], f (x 1) = m, f (x 2) = M
m £ f (x) £ M Î [ ].
:
1) M = m. f (x) = const = M = m. Î () f '(x) = 0. ;
2) m < M. f () = f (), m (), . . Î () , f () = m f () = M. f (x) , f '() = 0.
7.3. [ ] f (x), 1) f (x) [ ]; 2) f (x) (). Î () ,
.
. [ ]
F (x) = f (x) f () − × (x − ).
F (x) :
1) F (x) [ ] f (x)
f () + × (x − );
2) F (x) (). , f (x) () , F '(x) = f '(x) − ();
3) F () = 0; F () = 0, . . F () = F ().
Î () , F '() = 0, . .
f '() = .
f () f () = f '()() .
7.4. f (x) g (x) [ ] (). , , g '(x) ≠ 0. () ,
(7.1)
. , g () ≠ g (), . . (7.1) . , g () = g (), g (x) () h , g '(h) = 0. g '(x) ≠ 0 ().
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[ ]
F '(x) = f '(x) − × g '(x), f '() − × g '() = 0,
, g '() ≠ 0,
(7.1) .
7.1. g (x) = x, .
. , . .
7.2
7.5. f (x) g (x) (), 0, , , 0. , , f (x) = g (x) = 0 g '(x) ≠ 0 (). , ,
=
7.1. .
. f (x) = g (x) = (), f (x) = g (x) = 0. :
=
g '(x) = ≠ 0 Î (). ,
= =
7.2.
7.3. , . , , .
7.2.
=
7.4. , → ∞, → +∞, → −∞.
7.3.
−
7.5.
f (x) = g (x) = 0 f (x) = g (x) = ∞,
. -
7.4. .
. = = == =
=
7.6. 0 × ∞ ∞ − ∞ , .
7.5. .
. () = (0 × ∞) = =
7.6. (∞ − ∞)=
7.7. 00, 1∞, ∞0 = f (x) g ( x ).
f (x) g (x) = g (x)ℓn f (x)
, .
7.7. (1∞) = = = = = = =
7.8. = (∞0) = = = = = =
7.8. .
7.9. .
. . , . .
= .
.
= = 1+ = 1.
1. .
2. ?
3. f (x) [ ], ?
4. .
5. ?
6. ?
7. .