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INTEGRALI:<br />
Metodo di integrazione per parti: f ( x)<br />
⋅ g(<br />
x)<br />
dx = f ( x)<br />
⋅ g(<br />
x)<br />
− f ( x)<br />
⋅ g′<br />
( x)<br />
Metodo della sostituzione: ( x)<br />
Integrali impropri:<br />
1<br />
2<br />
)<br />
)<br />
f :<br />
→<br />
→<br />
→ +<br />
x a<br />
f :<br />
f :<br />
b<br />
a<br />
f :<br />
b<br />
a<br />
( a,<br />
b]<br />
lim f<br />
f<br />
( a,<br />
b]<br />
→ ℜ continua in ( a, b]<br />
( x)<br />
dx = lim f ( t)<br />
f<br />
Teorema :<br />
( x)<br />
Teorema :<br />
[ a,<br />
+∞)<br />
lim f<br />
x→<br />
+∞<br />
( x)<br />
+<br />
x→a<br />
x<br />
[ a,<br />
b)<br />
→ ℜ continua in [ a, b)<br />
( x)<br />
dx = lim f ( t)<br />
= 0<br />
b<br />
x<br />
−<br />
x→<br />
b<br />
a<br />
→ ℜ continua<br />
= +∞ con ordineα<br />
→ ℜ continua<br />
con ordineα<br />
dt =<br />
dt =<br />
± ∞<br />
± ∞<br />
b<br />
f<br />
a<br />
′ dx<br />
dx<br />
→ DIVERGE<br />
→ DIVERGE<br />
= g(<br />
t )<br />
= g′<br />
( t )<br />
( α ) = a<br />
( β ) = b<br />
x<br />
dx<br />
g<br />
g<br />
l∈<br />
ℜ → CONVERGE<br />
l ∈ℜ<br />
→ CONVERGE<br />
α < 1 → ∃l'integrale<br />
in senso improprio<br />
α ≥ 1 → l'integrale<br />
diverge<br />
α > 1 → ∃l'integrale<br />
in senso improprio<br />
α ≤ 1 → l'intgrale<br />
diverge<br />
Integrali con parametro: g ( x)<br />
= f ( x,<br />
y)<br />
f ∈ C<br />
p , q<br />
A =<br />
Se<br />
f<br />
NB :<br />
0(<br />
A)<br />
0<br />
∈ C ( A)<br />
[ a,<br />
b]<br />
× I<br />
x<br />
∈ C<br />
h<br />
0<br />
⊂ ℜ<br />
[ a, b]<br />
q<br />
p<br />
( x )<br />
( x )<br />
( x)<br />
( A)<br />
, ∃ p′<br />
( x)<br />
, q′<br />
( x)<br />
in [ a, b]<br />
∃ g′<br />
( x)<br />
= f ( x, y)<br />
α ( x )<br />
( x)<br />
= u(<br />
t)<br />
a<br />
2<br />
dt<br />
g è continua<br />
h′<br />
in<br />
( x)<br />
( x)<br />
= u(<br />
α(<br />
x)<br />
) α′<br />
( x)<br />
, k(<br />
x)<br />
= u(<br />
t)<br />
q<br />
p<br />
x<br />
b<br />
β ( x)<br />
=<br />
dt<br />
dt<br />
β<br />
α<br />
dy<br />
f<br />
[ g(<br />
t)<br />
] ⋅ g′<br />
( t)dt<br />
dy + f<br />
k′<br />
( x, q(<br />
x)<br />
) ⋅q′<br />
( x)<br />
− f ( x, p(<br />
x)<br />
) ⋅p′<br />
( x)<br />
( x)<br />
= −u(<br />
β ( x)<br />
) β′<br />
( x)<br />
1