=ƒ() , , d ( dƒ()): dy=ƒ'()∆.
:
, .
- :
dc = 0, = const. - :
d(u+v)=du + dv
. ,
d(u+c) = du (c= const).
- :
d(uv) = udv + vdu.
.
d(cu) = cdu ( = const).
- u/v = () v = v(x)
- ( ): , .
.
f . f f". ,
f" (x) = (f' (x)) '.
(n - 1)- f, n - (n - 1)- f f(n). ,
f(n) (x) = (f(n-1) (x)) ', n ϵ N, f(0) (x) = f (x).
n .
n - f (n - 1)- . ,
dnf (x) = d (dn -1 f (x)), d 0 f (x) = f (x), n ϵ N.
x - ,
dx = const d 2 x = d 3 x =... = dnx = 0.
dnf (x) = f (n)(x)(dx) n.
n -
.
:
f: [ a, b ] → R [ a, b ], . , , f (a) = f (b). [ a, b ] ξ , f' (ξ) = 0.
f: [ a, b ] → R [ a, b ] , , f (b) - f (a) = f' (ξ)(b - a).
f g [ a, b ] ] a, b [ , , g' (x) ≠ 0 ] a, b [, ,
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, g (a) ≠ g (b), g' (x) ≠ 0 :