MATEMAATLINE ANALRRS II 1. KORDSED INTEGRAALID ...
MATEMAATLINE ANALRRS II 1. KORDSED INTEGRAALID ...
MATEMAATLINE ANALRRS II 1. KORDSED INTEGRAALID ...
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10. R axdx = ax + C ln a<br />
1<strong>1.</strong> R dx<br />
1+x2 = arctan x + C<br />
12. R<br />
p dx<br />
1 x2 = arcsin x + C<br />
ja integraali omadusi<br />
I R [f(x) g(x)] dx = R R<br />
f(x)dx g(x)dx<br />
<strong>II</strong> R af(x)dx = a R f(x)dx<br />
<strong>II</strong>I R f(x)dx = F (x) + C ! R f(ax + b)dx = 1F<br />
(ax + b) + C<br />
a<br />
Kehtib ka muutujate vahetuse valem e. asendusvõte<br />
R f ['(x)] ' 0 (x)dx = R f(u)du, kus u = '(x)<br />
ja ositi integreerimise<br />
R<br />
valem<br />
R<br />
udv = uv vdu.<br />
Näide 1<strong>1.</strong><br />
<strong>1.</strong> R (2x 3 3 sin x+5 p x)dx = 2 x3+1<br />
2. R xdx<br />
3. R 2<br />
1<br />
3( cos x)+5 3+1 x 1 2 +1<br />
1<br />
2<br />
1+x2 = (u = 1 + x2 ; du = 2xdx; xdx = du<br />
R<br />
1 du ) = 2 2 u<br />
= ln (1 + x 2 ) + C<br />
dx<br />
= (u = ln x; du =<br />
ln 3 xdx<br />
x<br />
= 4p ln 4 2 = ln 2<br />
4. R x ln xdx =<br />
5,<br />
R 3<br />
4<br />
1<br />
2<br />
x ) = R ln 2<br />
ln 1 u3du = u4<br />
4<br />
u = ln x du = dx<br />
x<br />
dv = xdx v = x2<br />
2<br />
= x2 ln x<br />
2<br />
arcsin p x<br />
p dx = 1 x u = arcsin p x du = 1 p 1<br />
1 x 2 p x<br />
dv = dx p v = 2 1 x p 1 x<br />
= 2 p 1 x arcsin p x j 3 R 3<br />
4 4 2<br />
1 1<br />
2 2<br />
p 1 x<br />
2 p 1 x p dx = x<br />
= 2 1<br />
2 arcsin p 3 + p2 arcsin 2 2 1<br />
R 3<br />
p 4 + pdx 1 =<br />
2 x<br />
2<br />
= 3 + 2<br />
4 p 2 + 2p2 j 3<br />
4<br />
Määratud integraali rakendusi.<br />
1<br />
2<br />
= 12 3 p 2 4 + p 3 p 2<br />
1 +C =<br />
+1 2x4 +3 cos x+ 10<br />
3 xpx+C ln u + C =<br />
= 1<br />
2<br />
jln 2<br />
0 = 1<br />
4 ln4 2 =<br />
R<br />
xdx<br />
2 = x2 ln x<br />
2<br />
=<br />
x 2<br />
4 +C<br />
<strong>1.</strong> Tasapinnalise kujundi pindala.<br />
Kui kõvertrapets (vaata joonist all) on piiratud ülalt ja alt vastavalt joontega<br />
y = f(x) ja y = g(x) ning vasakult ja paremalt vastavalt sirgetega x = a<br />
ja x = b, siis tema pindala saab leida valemist<br />
[f(x) g(x)] dx<br />
S = R b<br />
a<br />
8