a , u x. y x. e: ln y = u ln a. x , ln y , ln a ,
y = ln x
(15)
y = ln u, u x, (15)
(16)
(16), a.
- ,
38.
:
f(x) = C, C ∈ R | 0 (-, !) |
f(x) = xn | n xn − 1 |
f(x) = sin x | cos x |
f(x) = cos x | − sin x |
f(x) = tg x | 1/cos2 x |
f(x) = ctg x | − 1/sin2 x |
f(x) = ln x | 1/x |
f(x) = loga x | 1/(x ln a) |
f(x) = ex | ex |
f: [ a, b ] → [ c, d ], g:[ a 1, b 1] → [ c 1, d 1], [ a 1, b 1] [ c, d ]. f 0 [ a, b ], g y 0 = f (x 0) [ a 1, b 1], F (x) = g (f (x)) 0 ,
g ' (f (x 0)) f ' (x 0).
-
- y = uv, u=u(x), v=v(x).
- .
. = f (y) (a, b) f' (y), . = f--1 (x) [ f--1 (x)] ',
y=y(x) F(x,y)=0, F(x,y) F ' y(x, y) 0, y'(x) y'(t) = - F'x(x, y) / F'y(x, y).
f(x) .
dy df(x).
, dy = f(x)dx.
.
u = f(x) v = g(x)- , , :
1) d(u v) = (u v)dx = udx vdx = du dv
|
|
2) d(uv) = (uv)dx = (uv + vu)dx = vdu + udv
3) d(Cu) = Cdu
4)