, .
1. .
t1, 1, t2 - 2. υ1 1. 1 2 = ∆S - , ∆t = t2 t1 :
υ, , , 2 → 1, a ∆t → 0, υ → υ1 .. υ 1 = lim ∆t→0∆S/∆t
2. , f(x) .
= f(x) 1(1;1) 2(2;2). tgα1, α1 - , 1. 12, :
tgα2 = ∆y/∆x
2 → 1, ∆ → 0, a tgα2 → tgα1, :
tgα1 =lim∆x→0∆y/∆x
, , - .
, .
: f1 () = 1 = lim∆x→0 ∆y/∆x
, . .
: = 2-1
1. ∆, ∆:
+ ∆ = ( + ∆)2-1
2. ∆:
+ ∆ = 2+2∆ +∆2-1
-
= x2 1
------------------------------
0 + ∆ = 0 + 2∆ + ∆2-0
∆ = 2∆ + ∆2
3. .
y1x = lim∆x→0 ∆y/∆x = lim∆x→0 (2x∆x + ∆x2)/∆x = lim∆x→0 (2x + ∆x) = 2x
, .. . , :
1. .
= const. ' = 0. : = 2, ' = 0.
2. .
= n, ' = nn-1. : = 3, ' = 3-1 = 2.
3. .
= , = 1, '=11-1; '=1=1.
4. ,
= x; ' = In a.
5. .
= x; ' = x
6. .
1) = logax; ` = 1/(x ina), 2) = In ; ` = 1/x
7. .
|
|
= sinx, ` = cosxy = cosx, ` = -sin
y = tgx, y`x = 1/(cos2x)y = ctgx, ` = -1/sin2x
1. .
y = Cf(x), y'x= C[f(x)]' y = 2/5x5, y'x=2/5[x5] = 2/55x4 =2 x4
2. .
y = u v, y'x =u` v'x, y = 3x2 + lnx, y'x = 3 * 2x + 1/x = 6x + 1/x
3. .
y = uv, yx =u'xv + v'xu, y = xsinx,
` =l sinx + x cosx = sin x+x cosx
4. , , .
y = u/v, y`x = (vu`x uv`x)/v2
y = (3x-1)/x, y`x = (x(3x 1) - (3x 1)x`)/x2 = (3x 3x + 1)/x2 = 1/x2
5. .
Z, = f(Z), Z X, Z = f(X). = f[f(x)] .
c X Z X.
' =y'z * Z`x
y=sinx2, z = x2, y = sinz, y`z =cosz, z`x =2x
yx =y`z * z`x = 2x cosz = 2x cosx2.