Integrales
c 2001-2005 Salvador Blasco Llopis
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on 2.1 Espa˜
na.
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eptima revisi´
on: Febrero
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on: Julio
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on: Mayo
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on: Mayo
Tercera revisi´
on: Marzo
1.
1.1.
1.1.1.
Integrales indefinidas
Funciones racionales e irracionales
Contienen ax +b
1
(ax + b)n+1 + C,
a(n + 1)
(1)
(ax + b)n dx =
(2)
dx
1
= ln |ax + b| + C
ax + b
a
(3)
dx
1
x
+C
= ln
x(ax + b)
a
ax + b
(4)
1
1
dx
=− ·
+C
2
(1 + x)
1+ x
(5)
1
2
1
1
xdx
=− ·
−
·
+C
(1 + bx)3
2b (1 + bx)2
2b 1 + bx
1.1.2.
Contienen
(6)
(7)
√
ax + b
√
2(3bx − 2a)(a + bx)3/2
+C
x a + bxdx =
15b2
√
x
2(bx − 2a) a + bx
√
dx =
+C
3b2
a + bx
1
n=1
2005
2003
2002
2001
2001
(8)(9)
dx
=
x a + bx
√
√
√1 ln
a
√
√
√a+bx−√a + C,
a+bx+ a
√2 arctan a+bx + C,
−a
−a
√
a + bx
dx = 2 a + bx + a
x
1.1.3.
Contienen x2 ± a2
(10)
dx
1
x
= arctan + C,
a2 + x2
a
a
(11)
1.1.4.
(x2
a>0
a<0
dx
+C
x a + bx
√
a>0
xdx
1
=√
+C
2
3/2
2
±a )
x ± a2
Contienen a2 − x2 ,
x
2
x
x
a2
arc sen + C,
2
a
(12)
(a2 − x2 )3/2 dx =
(13)
dx
1
1
a+x
x
+ C = arctanh
=
ln
a2 − x22a
a−x
a
a
(14)
1.1.5.
(a2
x2 ± a2 dx
√
x2 ± a 2
=
=
x2 ± a2 dx =
(16)
x
(17)
x3
(18)
√
a>0
dx
x
= √
+C
2
3/2
2
−x )
a a2 − x2
Contienen
(15)
a 2 − x2 +
1
x a2 ± x2 + a2 ln x + a2 ± x2 + C =
2
√
1
a2
2
2
(+)
2 x√a + x + 2 arcsenhx + C
2
1
2 − x2 + a arccoshx + C
x
a
(−)
2
2
1 2
(x ± a2 )3/2 + C
3
1
2
x2 + a2 dx = ( x2 − a2 )(a2 + x2 )3/2 + C
5
5
x2 − a 2
dx =
x
x2 − a2 − a ·arc cos
(19)
√
dx
x
= a · arcsenh + C
a
x2 + a 2
(20)
√
x2
(21)
1
a
dx
= arc cos
+ C,
2
2
a
|x|
x x −a
dx
= ln x +
− a2
a
+C
|x|
x2 − a2 + C = arccosh
√
2
(a > 0)
x
+ C,
a
(a > 0)
(22)
(23)
(24)
√
dx
x2 ± a 2
√
+C
=∓
2
2
2
a2 x
x x ±a
xdx
= x2 ± a 2 + C
x2 ± a 2
√
(a2 + x2 )3/2
x2 ± a 2
dx = ∓
+C
4
x
3a2 x3
x2
x
dx =
2
2
2
x −a
(25)
√
1.1.6.
Contienen
a2 − x2 dx =
(26)
x(28)
x2
(30)
a2 ± x2
1
x
2
a2 − x2 −
dx
x
= arc sen + C, a > 0
2
a
−x
√
dx
1
a + a2 − x2
√
+C
= − ln
a
x
x a2 − x2
(33)
√
x
dx = ±
a2 ± x2
(34)
√
a2
(35)
√
a2
1.1.7.
Contienen ax2 + bx + c
(36)
(a > 0)
x
a2
x
(2x2 − a2 ) a2 − x2 +
arc sen + C,
8
8
a
√
√
a2 ± x2
a + a2 ± x2
dx = a2 ± x2 − a ln
+C
x
x
√
− a2 − x2
dx
√
=
+C
a2 x
x2 a 2 − x 2
a2
(32)
a2
x
arc sen + C,
2
a
a2 − x2dx =
√
(31)
a2
x
arccosh + C
2
a
1
a2 ± x2 dx = ± (a2 ± x2 )3/2 + C
3
(27)
(29)
√
x2 − a 2 −
x2
x
dx = ±
2
2
±x
a 2 ± x2 + C
dx
= ln x +
+ x2
a 2 ± x2 ∓
x
a2
arc sen + C,
2
a
a2 + x2 + C = arcsenh
a>0
x
+ C,
a
a>0
√
2ax+b−√b2 −4ac
√ 1
ln
=
b2 −4ac
2ax+b+ b2 −4ac
2ax+b
2
dx
= √b2 −4ac arctanh √b2 −4ac + C, b2 > 4ac
=
ax2 + bx + c
√ 2
arctan √2ax+b
+ C,
b2 < 4ac
2
4ac−b2
4ac−b
2
+ C,
b2 = 4ac
− 2ax+b
3
a>0
(37)
(38)
(39)
1.1.8.
x
1
b
dx =
ln ax2 + bx + c −
ax2 + bx + c
2a
2a
dx
+C
ax2 + bx + c
x · dx
bx + 2c
= 2
+
n
+ bx + c)
(b − 4ac)(n − 1)(ax2 + bx + c)n−1
b(2n − 3)
dx
+ 2
, n = 0, 1,
2
(b − 4ac)(n − 1)
(ax + bx + c)n−1
(ax2
b2 < 4ac
2ax + b
dx
=
+
(ax2 + bx + c)n
−(b2 − 4ac)(n − 1)(ax2 + bx + c)n−1
2a(2n − 3)
dx
+
, n = 0, 1, b2 < 4ac−(b2 − 4ac)(n − 1)
(ax2 + bx + c)n−1
Contienen
√
ax2 + bx + c
(40)
ax2 + bx + cdx =
(41)
(42)
(43)
(44)
2ax + b
4a
a 0 + a 1 x + . . . + a n xn
√
dx
ax2 + bx + c
√
ax2
ax2 + bx + c +
√
ax2
dx
+ bx + c
Ver §3.5, p´
ag. 11: m´etodo alem´
an
√
dx
1
= √ ln 2ax + b + a ax2 + bx + c + C =
a
+ bx + c
1
2ax+b
√
√
∆ < 0, a > 0;
a arcsenh 4ac−b2 + C,
1
√ ln |2ax + b| + C,
∆ = 0, a > 0; , ∆ =b2 − 4ac
a
√1
+ C, ∆ > 0, a < 0;
arc sen √2ax+b
− −a
b2 −4ac
√
x
dx
ax2 + bx + c
b
√
√
−
dx =
2
2
a
2a
ax + bx + c
ax + bx + c
√ √ 2
−1
√ ln 2 c ax +bx+c+bx+2c + C, c > 0
dx
x
c
√
=
bx+2c
x ax2 + bx + c √1 arc sen √
+ C,
c<0
2
−c
1.2.
4ac − b2
8a
|x| b −4ac
Funciones trigonom´
etricas
1.2.1.
Contienen sen ax
(45)
1
ax
dx
+C
= ln tan
sen ax
a
2
(46)
sen2 axdx =
1 ax −...
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