Práctico #1
Práctico #1
Práctico #1
Análisis matemático II
Nombre: Martha Villazón Hinojosa
Calcular las siguientes integrales:
3
1.) 4 x 2 dx
1
3 dx
4x 2
𝑢 = 4𝑥 + 2
𝑑𝑢 = 4𝑑𝑥
𝑑𝑢
= 𝑑𝑥
4
1 du
3
u 4
3
ln u c
4
3
ln( 4 x 2) c
4
3 x
2.) dx
x 4
3 𝑥
= ∫ 𝑥 𝑑𝑥 − ∫ 4 𝑑𝑥
√
1 1
= 3∫ 𝑑𝑥 − 4 ∫ 𝑥 𝑑𝑥
√𝑥
1
1
= 3 ∫ 𝑥 −2 𝑑𝑥 − 4 ∫ 𝑥 𝑑𝑥
1
𝑥2 1 𝑥2 1
= 3 1 − + 𝐶 = 6 √𝑥 − 8 + 𝐶
4 2
2
x
3.) tan dx
2 𝑢 = 𝐶𝑜𝑠 (
𝑥
)
√2
𝑥
𝑆𝑒𝑛( ) 𝑥 √2
√2
= ∫ 𝑥 𝑑𝑥 𝑑𝑢 = −𝑆𝑒𝑛 ( )
𝐶𝑜𝑠( )
√2 √2 2
= − ∫ 𝑐𝑜𝑠𝑢 .
1 2
dx 2𝑑𝑢 𝑥
√2 − = 𝑆𝑒𝑛 ( ) 𝑑𝑥
√2 √2
2 𝑑𝑢
=− ∫
√2 𝑢
2
=− ln 𝑢 + 𝑐
√2
2 𝑥
=− ln(𝑐𝑜𝑠 )+𝑐
√2 √2
1
sen
4.) x dx = − ∫ 𝑠𝑒𝑛 𝑢. 𝑑𝑢 = −(− cos 𝑢 + 𝑐) = cos (1) + 𝑐
2 𝑥
x
1
𝑢=
𝑥
1
𝑑𝑢 = − 𝑑𝑥
𝑥2
1
−𝑑𝑢 = 𝑑𝑥
𝑥2
𝑢 = 3𝑥 4 + 14
𝑑𝑢 = 12𝑥 3 𝑑𝑥
𝑑𝑢
= 𝑥 3 𝑑𝑥
12
du
u
4
12
1
4
12 u du
5
*u c
1
12 5
1
= (3𝑥 4 + 14) + 𝑐
60
18𝑥
6.) ∫ 5 𝑑𝑥
√6𝑥 3 +1 𝑢 = 6𝑥 3 + 1
18𝑥𝑑𝑥 𝑑𝑢 = 18𝑥 2 𝑑𝑥
=∫
(6𝑥 3 + 1)25
1
=∫ 𝑑𝑢
𝑢52
= ∫ 𝑢 −25 𝑑𝑢
𝑢23
= 3 +c
2
2 3 2
= 𝑢2 + 𝑐 = √(6𝑥 3 + 3)3 + 𝑐
3 3
7.) ∫ 𝑐𝑜𝑠3𝑥𝑒 𝑠𝑒𝑛3𝑥 𝑑𝑥 𝑢 = 𝑆𝑒𝑛 3𝑥
𝑑𝑢 1 𝑑𝑢 = 3 𝐶𝑜𝑠 (3𝑥)𝑑𝑥
= ∫ 𝑒𝑢 = ∫ 𝑒 𝑢 𝑑𝑢
3 3
1
𝑑𝑢
= 𝑒𝑢 = 𝐶𝑜𝑠 (3𝑥)𝑑𝑥
3 3
1
= 3 𝑒 𝑆𝑒𝑛(3𝑥) + 𝐶
𝑺𝒆𝒄𝟐 √𝒙
8.) ∫ 𝒅𝒙
√𝒙 1⁄
𝑢 = √𝑥 = 𝑥 2
= ∫ 𝑆𝑒𝑐 2 𝑢 2𝑑𝑢
1⁄ 𝑑𝑥
𝑑𝑢 = 𝑥 − 2 =
= 2 ∫ 𝑠𝑒𝑐 2 𝑢 𝑑𝑢 √𝑥
𝑑𝑥
= 2 tan 𝑢 + 𝑐 2𝑑𝑢 =
= 2 tan √𝑥 + 𝑐 √𝑥
∫ 𝑥 𝑠𝑒𝑛𝑥 𝑑𝑥
𝑢=𝑥 𝑑𝑣 = 𝑠𝑒𝑛 𝑥𝑑𝑥
𝑑𝑢 = 𝑑𝑥 𝑣 = −𝑐𝑜𝑠 𝑥
= −𝑥 𝑐𝑜𝑠𝑥 − ∫ −𝑐𝑜𝑠𝑥 𝑑𝑥
= −𝑥 𝑐𝑜𝑠𝑥 + 𝑠𝑒𝑛𝑥
10.)∫(𝒙 + 𝟏) 𝑺𝒆𝒄𝟐 𝒙 𝒅𝒙
𝑢 =𝑥+1 𝑑𝑣 = 𝑆𝑒𝑐 2 𝑥
𝑑𝑢 = 𝑑𝑥 𝑣 = tan 𝑥
⇒ ∫ 𝑢 𝑑𝑣 = 𝑢𝑣 − ∫ 𝑣 𝑑𝑢
= (𝑥 + 1)𝑡𝑎𝑛𝑥 − ∫ 𝑡𝑎𝑛𝑥 𝑑𝑥
11.)∫ 𝟐𝒙 𝒆𝟑𝒙 𝒅𝒙
𝑢 = 2𝑥 2 𝑑𝑣 = 𝑒 3𝑥 𝑑𝑥
𝑑𝑢 = 4𝑥𝑑𝑥 𝑒 3𝑥
𝑣=
3
= ∫ 𝑢 𝑑𝑣 = 𝑢𝑣 − ∫ 𝑣 𝑑𝑢
𝑒 3𝑥 𝑒 3𝑥
= 2𝑥 2 − ∫ 4𝑥 𝑑𝑥
3 3
2 4
= 3 𝑥 2 𝑒 3𝑥 − ∫ 𝑒 3𝑥 𝑥 𝑑𝑥
3
2 4 𝑒 3𝑥 𝑒 3𝑥
= 3 𝑥 2 𝑒 3𝑥 − (𝑥 −∫ 𝑑𝑥)
3 3 3
2 4 4
= 3 𝑥 2 𝑒 3𝑥 − 𝑥 𝑒 3𝑥 − 9 𝑒 3𝑥 + 𝑐
9
𝑥2 𝑥2 1
= ln 𝑥 ( 2 + 𝑥) − ∫ ( 2 + 𝑥) 𝑥 𝑑𝑥
𝑥2 𝑥2
= ln 𝑥 ( 2 + 𝑥) − ∫ ( 2 + 1) 𝑑𝑥
𝑥2 𝑥2
= ln 𝑥 ( + 𝑥) − −𝑥+𝑐
2 4