3.3. = f (x) → ¥, e > 0 d , , │ │< d, │ f (x) − A │< e. f (x) = .
+¥ −¥.
3.4. = f (x) → +¥ ( → − ¥), e d > 0 , , > d ( < −d) │ f (x) − A │< e. : f (x) = ( f (x) = ).
3.4. , .
. e > 0. d > 0, > d
< e.
= = = .
> 0, = . < e > .
, d = , > d < e. , .
3.5. a = a() → ( → ¥), a() = 0 ( a() = 0).
, a() = ( 3)2 → 3, . . ( − 3)2 = 0; a() = → ¥, . . = 0.
1. = () → , () = + a(), a() → .
2. () = + a(), , a() → , () = .
3. → → .
4. → → .
5. → , → .
6. → , → .
3.6. = f (x) → , N d > 0, , 0 <│ − │< d, │ f (x)│> N.
→ , , f (x) = ¥ f (x) → ¥ → . f (x) , , f (x) = +¥, f (x) = −¥.
f (x) = → 0, g (x) = → 2.
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1. .
2. . .
3. .
4. .
5. . ?
6. .
7. ?