1: f (x) (; b), .
2: f (x) [ ; b ], (; b), , b .
.
1: ( ) f () 0 f ( 0)¹0. d >0 , Î( 0- d, 0+ d) f () , f ( 0).
2: (I -) f () [ ; b ] . Î(; b), f ()=0.
Ÿ : , , .
3: (II -) f () [ ; b ] f ()= f (b)= < C < . [ ; b ] , f ()= .
Ÿ : f () .
: f () , Y .
3: f (x) [ ; b ], >0 , Î[ ; b ] | f (x)|£ M.
4: (I ) f () [ ; b ], .
: (; b) .
4: () f (x), , () () , Y ().
5: (II ) f () [ ; b ], , 1, 2Î[ ; b ]
: :
5: () f (x) () .
5: (II ) .
6: ( ) = f () , Y . Y = j () , .
.
X y = f (x). 0Î 0 D , 0+D X. D = f ( 0+D )- f (x 0).
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1: = f (x) 0 D 0 ( , ).
. y = f (x) (, b) 0, - 0+D . . j (D ) . , D .
, k = tgj 0, ( 0; f (x 0)) D 0 ( ).
2: S = f (x) D 0 ( ).
, y = f (x) 0 y = f (x) ( 0; f (x 0)) .
. , y = f (x) , . . = f ()-, .
0 y = f (x 0), 1 - y = f (x 1).
D = x 1- 0 D y = f (x 1)- f (x 0)= f (x 0+D )- f (x 0).
D /D (v ) D , D /D D 0 0 (v ).
3: y = f (x) 0, D y D y = D + a (D )D ,
- , D , a (D ) - D , D 0, . . . , = f ¢( 0).
.
1: y = f (x) 0, , .
, - . .
2: y = f (x) 0, .
. . , , . . .