. ( ) y = f (x) , , .
, , ( ) .
. :
1) = ;
2) ;
3) =lg(x − 5 x +6).
.
. = f (x) , : f (− x) = f (x).
(. 9).
. = f (x) , : f (− x)=− f (x).
(. 10).
(. f (− x)¹− f (x) f (− x)¹ f (x)), y = f (x) .
, = 6 . f (− x)=(− x)6= x 6= f (x), .. : f (− x)=− f (x).
= − ; = + −5 ( ).
2.4. .
. = f (x) ¹0, :
f (x + T)= f (x).
. = f (x), , nT, n Î Z, . , , . , .
, =sin x =2 π, .. " Î Df sin (x +2π)=sin x.
.
. = f (x) , , .. 1< x 2 : f (x 1)< f (x 2), ..
(" x , x Î Df) [ x > x f (x )> f (x )]
. = f (x) , , .. < x : f (x )> f (x ),..
(" x , x Î Df) [ x > x f (x )< f (x )]
.
y = f (x) - , , , .. , .
|
|
:
1) y = kx + b k >0 k< 0.
2) y = a , >1 , <1.
3) y = x (− ; 0) (0; + ).
.
. y = f (x) , >0,
| f (x)| £ Î ,
: ($ >0) (" Î ) [| f (x)| M ].
($ , b Î R) (" Î ) [ £ f (x)£ b ]
.
, , = = b (. 13).
. = sin x , ..
(" Î R) [|si n x |£1 ].