Matematika pro Kybernetiku Lecture Notes
Matematika pro Kybernetiku Lecture Notes
Matematika pro Kybernetiku Lecture Notes
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x − Pˇríklad 8.7: Pro funkci f (x) = x e 2 vypočtěte<br />
4<br />
−2<br />
f (x) dx.<br />
ˇRešení: Funkce f je na intervalu 〈−2, 4〉 spojitá (tedy i omezená),<br />
a <strong>pro</strong>to integrál existuje. Máme:<br />
4<br />
−2<br />
x −<br />
x e 2 dx =<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
= 4<br />
− x<br />
2 = t<br />
− 1<br />
2<br />
dx = dt<br />
−2 1<br />
4 −2<br />
−2<br />
<br />
<br />
u = t v<br />
= <br />
<br />
′ = et u ′ = 1 v = et <br />
<br />
<br />
<br />
<br />
1<br />
<br />
<br />
<br />
<br />
<br />
<br />
=<br />
<br />
<br />
<br />
−2<br />
t e t 1<br />
dt = −4 t e<br />
−2<br />
t dt =<br />
1<br />
(−2t) e t (−2) dt =<br />
<br />
PP t t<br />
= −4 e 1 −2 −<br />
1<br />
e<br />
−2<br />
t <br />
dt<br />
= −4 ( e − (−2) e −2 ) − ( e − e −2 ) = −12 e −2 .<br />
=