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POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 1
TUGAS 3
MATEMATIKA 2
(Integral)
D
I
S
U
S
U
N
Oleh :
Nama : M. Habiburrakhman
NPM : 003 14 15
Prodi : Teknik Elektronika
Kelas : 1 EA
Semester : 2 (Dua)
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Kawasan Industri Air Kantung Sungailiat, Bangka 33211
Telp. (0717) 93586, Fax. (0717) 93585
Email :polman@polman-babel.ac.id
Website :www.polman-babel.ac.id
TAHUN AJARAN 2014/2015
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 2
1. Hitunglah โˆซ (๐‘ฅ12
โˆ’
12
๐‘ฅ5 + โˆš๐‘ฅ103
) ๐‘‘๐‘ฅ
โˆซ(๐‘ฅ12
โˆ’
12
๐‘ฅ5
+ โˆš ๐‘ฅ103
) ๐‘‘๐‘ฅ
= โˆซ ๐‘ฅ12
โˆ’ 12๐‘ฅโˆ’5
+ ๐‘ฅ
10
3 ๐‘‘๐‘ฅ
=
1
13
๐‘ฅ13
โˆ’
12
โˆ’4
๐‘ฅโˆ’4
+
1
13
3
๐‘ฅ
13
3 + ๐ถ
=
1
13
๐‘ฅ13
+ 3๐‘ฅโˆ’4
+
3
13
๐‘ฅ
13
3 + ๐ถ
=
1
13
๐‘ฅ13
+
3
๐‘ฅ4
+
3
13
โˆš ๐‘ฅ133
+ ๐ถ
2. Hitunglah โˆซ[cos(7๐‘ฅ โˆ’ 12) + ๐‘ ๐‘’๐‘2(9๐‘ฅ โˆ’ 15)] ๐‘‘๐‘ฅ
โˆซ[cos(7๐‘ฅ โˆ’ 12) + ๐‘ ๐‘’๐‘2(9๐‘ฅ โˆ’ 15)] ๐‘‘๐‘ฅ
=
1
7
sin(7๐‘ฅ โˆ’ 12)+
1
9
tan(9๐‘ฅ โˆ’ 15) + ๐ถ
3. Dengan menggunakan cara substitusi hitunglah โˆซ
๐‘ฅ2
โˆš3+๐‘ฅ3 ๐‘‘๐‘ฅ
โˆซ
๐‘ฅ2
โˆš3 + ๐‘ฅ3
๐‘‘๐‘ฅ
= โˆซ ๐‘ฅ2
.(3 + ๐‘ฅ3)โˆ’
1
2 ๐‘‘๐‘ฅ
๐‘ข = 3 + ๐‘ฅ3
โ†’
๐‘‘๐‘ข
๐‘‘๐‘ฅ
= 3๐‘ฅ2
โ†’ ๐‘‘๐‘ฅ =
๐‘‘๐‘ข
3๐‘ฅ2
โˆซ ๐‘ฅ2
. (3 + ๐‘ฅ3)โˆ’
1
2 ๐‘‘๐‘ฅ = โˆซ ๐‘ฅ2
. ๐‘ข
โˆ’
1
2 .
๐‘‘๐‘ข
3๐‘ฅ2
=
1
3
โˆซ ๐‘ข
โˆ’
1
2 ๐‘‘๐‘ข =
1
3
.
1
1
2
๐‘ข
1
2 + ๐ถ
=
2
3
โˆš ๐‘ข + ๐ถ =
2
3
โˆš3 + ๐‘ฅ3 + ๐ถ
4. Dengan menggunakan cara substitusi hitunglah โˆซ(2๐‘ฅ + 2)cos(5๐‘ฅ2
+ 10๐‘ฅ + 8) ๐‘‘๐‘ฅ
โˆซ(2๐‘ฅ + 2)cos(5๐‘ฅ2
+ 10๐‘ฅ + 8) ๐‘‘๐‘ฅ
๐‘ข = 5๐‘ฅ2
+ 10๐‘ฅ + 8 โ†’
๐‘‘๐‘ข
๐‘‘๐‘ฅ
= 10๐‘ฅ + 10 โ†’ ๐‘‘๐‘ฅ =
๐‘‘๐‘ข
10๐‘ฅ + 10
โˆซ(2๐‘ฅ + 2)cos(5๐‘ฅ2
+ 10๐‘ฅ + 8) ๐‘‘๐‘ฅ = โˆซ(2๐‘ฅ + 2).cos ๐‘ข .
๐‘‘๐‘ข
10๐‘ฅ + 10
= โˆซ(2๐‘ฅ + 2).cos ๐‘ข .
๐‘‘๐‘ข
5(2๐‘ฅ + 2)
=
1
5
โˆซcos ๐‘ข ๐‘‘๐‘ข
=
1
5
sin ๐‘ข + ๐ถ =
1
5
sin(5๐‘ฅ2
+ 10๐‘ฅ + 8) + ๐ถ
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 3
5. Hitunglah integral parsil dari โˆซ 2๐‘ฅ. sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ
โˆซ2๐‘ฅ. sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ
๐‘ข = 2๐‘ฅ โ†’
๐‘‘๐‘ข
๐‘‘๐‘ฅ
= 2 โ†’ ๐‘‘๐‘ข = 2๐‘‘๐‘ฅ
๐‘‘๐‘ฃ = sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ โ†’ ๐‘ฃ = โˆซsin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ = โˆ’
1
12
cos(12๐‘ฅ + 4)
โˆซ ๐‘ข. ๐‘‘๐‘ฃ = ๐‘ข. ๐‘ฃ โˆ’ โˆซ ๐‘ฃ ๐‘‘๐‘ข
โˆซ2๐‘ฅ. sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ = 2๐‘ฅ. โˆ’
1
12
cos(12๐‘ฅ + 4) โˆ’ โˆซ โˆ’
1
12
cos(12๐‘ฅ + 4). 2๐‘‘๐‘ฅ
= โˆ’
1
6
๐‘ฅ cos(12๐‘ฅ + 4) + 2 [
1
12
12
sin(12๐‘ฅ + 4)] + ๐ถ
= โˆ’
1
6
๐‘ฅ cos(12๐‘ฅ + 4) +
1
72
sin(12๐‘ฅ + 4) + ๐ถ
6. Dengan menggunakan bantuan table hitunglah integral dari โˆซ ๐‘ฅ3
๐‘’โˆ’5๐‘ฅ
๐‘‘๐‘ฅ
+ ๐‘ฅ3
(turunan) ๐‘’โˆ’5๐‘ฅ
(integral)
- 3๐‘ฅ2
โˆ’
1
5
๐‘’โˆ’5๐‘ฅ
+ 6๐‘ฅ
1
25
๐‘’โˆ’5๐‘ฅ
- 6 โˆ’
1
125
๐‘’โˆ’5๐‘ฅ
+ 0
1
625
๐‘’โˆ’5๐‘ฅ
= โˆ’
1
5
๐‘ฅ3
๐‘’โˆ’5๐‘ฅ
โˆ’
3
25
๐‘ฅ2
๐‘’โˆ’5๐‘ฅ
โˆ’
6
125
๐‘ฅ๐‘’โˆ’5๐‘ฅ
โˆ’
6
625
๐‘’โˆ’5๐‘ฅ
+ ๐ถ
7. Hitung integral fungsi rasional dari โˆซ
3๐‘ฅ
๐‘ฅ2โˆ’2๐‘ฅโˆ’15
๐‘‘๐‘ฅ
3๐‘ฅ
๐‘ฅ2 โˆ’ 2๐‘ฅ โˆ’ 15
=
3๐‘ฅ
(๐‘ฅ โˆ’ 5)(๐‘ฅ + 3)
=
๐ด
( ๐‘ฅ โˆ’ 5)
+
๐ต
( ๐‘ฅ + 3)
๐‘ฅ โˆ’ 5 = 0 โ†’ ๐‘ฅ = 5 โ†’ ๐ด =
3.5
(5 + 3)
=
15
8
๐‘ฅ + 3 = 0 โ†’ ๐‘ฅ = โˆ’3 โ†’ ๐ต =
3. โˆ’3
(โˆ’3 โˆ’ 5)
=
9
8
โˆซ
3๐‘ฅ
๐‘ฅ2 โˆ’ 2๐‘ฅ โˆ’ 15
๐‘‘๐‘ฅ = โˆซ
15
8
( ๐‘ฅ โˆ’ 5)
๐‘‘๐‘ฅ + โˆซ
9
8
( ๐‘ฅ + 3)
๐‘‘๐‘ฅ
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 4
=
15
8
ln| ๐‘ฅ โˆ’ 5| +
9
8
ln| ๐‘ฅ + 3| + ๐ถ
8. Hitunglah integral tentu dari โˆซ (๐‘ฅ4
+ 5๐‘ฅ +
1
๐‘ฅ3)
4
1
๐‘‘๐‘ฅ
โˆซ(๐‘ฅ4
+ 5๐‘ฅ +
1
๐‘ฅ3
)
4
1
๐‘‘๐‘ฅ = โˆซ(๐‘ฅ4
+ 5๐‘ฅ + ๐‘ฅโˆ’3
)
4
1
๐‘‘๐‘ฅ
=
1
5
๐‘ฅ5
+
5
2
๐‘ฅ2
โˆ’
1
2
๐‘ฅโˆ’2
=
1
5
๐‘ฅ5
+
5
2
๐‘ฅ2
โˆ’
1
2๐‘ฅ2
= (
1
5
. 45
+
5
2
. 42
โˆ’
1
2.42
) โˆ’ (
1
5
. 15
+
5
2
. 12
โˆ’
1
2.12
)
= (
1024
5
+ 40 โˆ’
1
32
) โˆ’ (
1
5
+
5
2
โˆ’
1
2
)
=
1024
5
โˆ’
1
5
โˆ’
1
32
โˆ’
4
2
+ 40 =
1023
5
โˆ’
1
32
+ 38
=
32736 โˆ’ 5 + 6080
160
=
38811
160
9. Tentukan luas daerah yang dibatasi oleh kurva ๐‘ฆ = ๐‘ฅ2
+ 4dan garis ๐‘ฆ = โˆ’๐‘ฅ + 16
๐‘ฆ1 = ๐‘ฆ2 โ†’ ๐‘ฅ2
+ 4 = โˆ’๐‘ฅ + 16
๐‘ฅ2
+ ๐‘ฅ โˆ’ 12 = 0
( ๐‘ฅ + 4)( ๐‘ฅ โˆ’ 3) = 0
๐‘ฅ = โˆ’4 ๐‘Ž๐‘ก๐‘Ž๐‘ข ๐‘ฅ = 3
๐ฟ = โˆซ(โˆ’๐‘ฅ + 16) โˆ’ ( ๐‘ฅ2
+ 4)
3
โˆ’4
๐‘‘๐‘ฅ
= โˆซ(โˆ’๐‘ฅ2
โˆ’ ๐‘ฅ + 12)
3
โˆ’4
๐‘‘๐‘ฅ = โˆ’
1
3
๐‘ฅ3
โˆ’
1
2
๐‘ฅ2
+ 12๐‘ฅ
= (โˆ’
1
3
. 33
โˆ’
1
2
. 32
+ 12.3) โˆ’ (โˆ’
1
3
. โˆ’43
โˆ’
1
2
. โˆ’42
+ 12. โˆ’4)
= (โˆ’9 โˆ’
9
2
+ 36) โˆ’ (
64
3
โˆ’ 8 โˆ’ 48)
= 27 โˆ’
9
2
โˆ’
64
3
+ 56 = โˆ’
64
3
โˆ’
9
2
+ 83
=
โˆ’128 โˆ’ 27 + 498
6
=
343
6
๐‘ ๐‘Ž๐‘ก๐‘ข๐‘Ž๐‘› ๐‘™๐‘ข๐‘Ž๐‘ 
10. Tentukanlah volume benda yang terbentuk dengan memutar mengelilingi sumbu -y
dari daerah yang dibatasi oleh ๐‘ฆ = 3๐‘ฅ, ๐‘ฆ = ๐‘ฅ, ๐‘ฆ = 0 dan garis ๐‘ฆ = 3
๐‘ฆ = 3๐‘ฅ โ†’ ๐‘ฅ =
1
3
๐‘ฆ
๐‘ฆ = ๐‘ฅ โ†’ ๐‘ฅ = ๐‘ฆ
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 5
๐‘‰ = ๐œ‹ โˆซ( ๐‘ฅ1
2
โˆ’ ๐‘ฅ2
2)
3
0
๐‘‘๐‘ฆ
= ๐œ‹ โˆซ(๐‘ฆ2
โˆ’ (
1
3
๐‘ฆ)
2
)
3
0
๐‘‘๐‘ฆ = ๐œ‹ โˆซ (๐‘ฆ2
โˆ’
1
9
๐‘ฆ2
)
3
0
๐‘‘๐‘ฆ
= ๐œ‹ โˆซ
8
9
๐‘ฆ2
3
0
๐‘‘๐‘ฆ = ๐œ‹ [
8
9
3
๐‘ฆ3
]
= ๐œ‹ [
8
27
๐‘ฆ3
] = ๐œ‹ [
8
27
. 33
โˆ’
8
27
. 03
]
= ๐œ‹[8 โˆ’ 0] = 8๐œ‹ ๐‘ ๐‘Ž๐‘ก๐‘ข๐‘Ž๐‘› ๐‘ฃ๐‘œ๐‘™๐‘ข๐‘š๐‘’

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Tugas 3

  • 1. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 1 TUGAS 3 MATEMATIKA 2 (Integral) D I S U S U N Oleh : Nama : M. Habiburrakhman NPM : 003 14 15 Prodi : Teknik Elektronika Kelas : 1 EA Semester : 2 (Dua) POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Kawasan Industri Air Kantung Sungailiat, Bangka 33211 Telp. (0717) 93586, Fax. (0717) 93585 Email :polman@polman-babel.ac.id Website :www.polman-babel.ac.id TAHUN AJARAN 2014/2015
  • 2. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 2 1. Hitunglah โˆซ (๐‘ฅ12 โˆ’ 12 ๐‘ฅ5 + โˆš๐‘ฅ103 ) ๐‘‘๐‘ฅ โˆซ(๐‘ฅ12 โˆ’ 12 ๐‘ฅ5 + โˆš ๐‘ฅ103 ) ๐‘‘๐‘ฅ = โˆซ ๐‘ฅ12 โˆ’ 12๐‘ฅโˆ’5 + ๐‘ฅ 10 3 ๐‘‘๐‘ฅ = 1 13 ๐‘ฅ13 โˆ’ 12 โˆ’4 ๐‘ฅโˆ’4 + 1 13 3 ๐‘ฅ 13 3 + ๐ถ = 1 13 ๐‘ฅ13 + 3๐‘ฅโˆ’4 + 3 13 ๐‘ฅ 13 3 + ๐ถ = 1 13 ๐‘ฅ13 + 3 ๐‘ฅ4 + 3 13 โˆš ๐‘ฅ133 + ๐ถ 2. Hitunglah โˆซ[cos(7๐‘ฅ โˆ’ 12) + ๐‘ ๐‘’๐‘2(9๐‘ฅ โˆ’ 15)] ๐‘‘๐‘ฅ โˆซ[cos(7๐‘ฅ โˆ’ 12) + ๐‘ ๐‘’๐‘2(9๐‘ฅ โˆ’ 15)] ๐‘‘๐‘ฅ = 1 7 sin(7๐‘ฅ โˆ’ 12)+ 1 9 tan(9๐‘ฅ โˆ’ 15) + ๐ถ 3. Dengan menggunakan cara substitusi hitunglah โˆซ ๐‘ฅ2 โˆš3+๐‘ฅ3 ๐‘‘๐‘ฅ โˆซ ๐‘ฅ2 โˆš3 + ๐‘ฅ3 ๐‘‘๐‘ฅ = โˆซ ๐‘ฅ2 .(3 + ๐‘ฅ3)โˆ’ 1 2 ๐‘‘๐‘ฅ ๐‘ข = 3 + ๐‘ฅ3 โ†’ ๐‘‘๐‘ข ๐‘‘๐‘ฅ = 3๐‘ฅ2 โ†’ ๐‘‘๐‘ฅ = ๐‘‘๐‘ข 3๐‘ฅ2 โˆซ ๐‘ฅ2 . (3 + ๐‘ฅ3)โˆ’ 1 2 ๐‘‘๐‘ฅ = โˆซ ๐‘ฅ2 . ๐‘ข โˆ’ 1 2 . ๐‘‘๐‘ข 3๐‘ฅ2 = 1 3 โˆซ ๐‘ข โˆ’ 1 2 ๐‘‘๐‘ข = 1 3 . 1 1 2 ๐‘ข 1 2 + ๐ถ = 2 3 โˆš ๐‘ข + ๐ถ = 2 3 โˆš3 + ๐‘ฅ3 + ๐ถ 4. Dengan menggunakan cara substitusi hitunglah โˆซ(2๐‘ฅ + 2)cos(5๐‘ฅ2 + 10๐‘ฅ + 8) ๐‘‘๐‘ฅ โˆซ(2๐‘ฅ + 2)cos(5๐‘ฅ2 + 10๐‘ฅ + 8) ๐‘‘๐‘ฅ ๐‘ข = 5๐‘ฅ2 + 10๐‘ฅ + 8 โ†’ ๐‘‘๐‘ข ๐‘‘๐‘ฅ = 10๐‘ฅ + 10 โ†’ ๐‘‘๐‘ฅ = ๐‘‘๐‘ข 10๐‘ฅ + 10 โˆซ(2๐‘ฅ + 2)cos(5๐‘ฅ2 + 10๐‘ฅ + 8) ๐‘‘๐‘ฅ = โˆซ(2๐‘ฅ + 2).cos ๐‘ข . ๐‘‘๐‘ข 10๐‘ฅ + 10 = โˆซ(2๐‘ฅ + 2).cos ๐‘ข . ๐‘‘๐‘ข 5(2๐‘ฅ + 2) = 1 5 โˆซcos ๐‘ข ๐‘‘๐‘ข = 1 5 sin ๐‘ข + ๐ถ = 1 5 sin(5๐‘ฅ2 + 10๐‘ฅ + 8) + ๐ถ
  • 3. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 3 5. Hitunglah integral parsil dari โˆซ 2๐‘ฅ. sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ โˆซ2๐‘ฅ. sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ ๐‘ข = 2๐‘ฅ โ†’ ๐‘‘๐‘ข ๐‘‘๐‘ฅ = 2 โ†’ ๐‘‘๐‘ข = 2๐‘‘๐‘ฅ ๐‘‘๐‘ฃ = sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ โ†’ ๐‘ฃ = โˆซsin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ = โˆ’ 1 12 cos(12๐‘ฅ + 4) โˆซ ๐‘ข. ๐‘‘๐‘ฃ = ๐‘ข. ๐‘ฃ โˆ’ โˆซ ๐‘ฃ ๐‘‘๐‘ข โˆซ2๐‘ฅ. sin(12๐‘ฅ + 4) ๐‘‘๐‘ฅ = 2๐‘ฅ. โˆ’ 1 12 cos(12๐‘ฅ + 4) โˆ’ โˆซ โˆ’ 1 12 cos(12๐‘ฅ + 4). 2๐‘‘๐‘ฅ = โˆ’ 1 6 ๐‘ฅ cos(12๐‘ฅ + 4) + 2 [ 1 12 12 sin(12๐‘ฅ + 4)] + ๐ถ = โˆ’ 1 6 ๐‘ฅ cos(12๐‘ฅ + 4) + 1 72 sin(12๐‘ฅ + 4) + ๐ถ 6. Dengan menggunakan bantuan table hitunglah integral dari โˆซ ๐‘ฅ3 ๐‘’โˆ’5๐‘ฅ ๐‘‘๐‘ฅ + ๐‘ฅ3 (turunan) ๐‘’โˆ’5๐‘ฅ (integral) - 3๐‘ฅ2 โˆ’ 1 5 ๐‘’โˆ’5๐‘ฅ + 6๐‘ฅ 1 25 ๐‘’โˆ’5๐‘ฅ - 6 โˆ’ 1 125 ๐‘’โˆ’5๐‘ฅ + 0 1 625 ๐‘’โˆ’5๐‘ฅ = โˆ’ 1 5 ๐‘ฅ3 ๐‘’โˆ’5๐‘ฅ โˆ’ 3 25 ๐‘ฅ2 ๐‘’โˆ’5๐‘ฅ โˆ’ 6 125 ๐‘ฅ๐‘’โˆ’5๐‘ฅ โˆ’ 6 625 ๐‘’โˆ’5๐‘ฅ + ๐ถ 7. Hitung integral fungsi rasional dari โˆซ 3๐‘ฅ ๐‘ฅ2โˆ’2๐‘ฅโˆ’15 ๐‘‘๐‘ฅ 3๐‘ฅ ๐‘ฅ2 โˆ’ 2๐‘ฅ โˆ’ 15 = 3๐‘ฅ (๐‘ฅ โˆ’ 5)(๐‘ฅ + 3) = ๐ด ( ๐‘ฅ โˆ’ 5) + ๐ต ( ๐‘ฅ + 3) ๐‘ฅ โˆ’ 5 = 0 โ†’ ๐‘ฅ = 5 โ†’ ๐ด = 3.5 (5 + 3) = 15 8 ๐‘ฅ + 3 = 0 โ†’ ๐‘ฅ = โˆ’3 โ†’ ๐ต = 3. โˆ’3 (โˆ’3 โˆ’ 5) = 9 8 โˆซ 3๐‘ฅ ๐‘ฅ2 โˆ’ 2๐‘ฅ โˆ’ 15 ๐‘‘๐‘ฅ = โˆซ 15 8 ( ๐‘ฅ โˆ’ 5) ๐‘‘๐‘ฅ + โˆซ 9 8 ( ๐‘ฅ + 3) ๐‘‘๐‘ฅ
  • 4. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 4 = 15 8 ln| ๐‘ฅ โˆ’ 5| + 9 8 ln| ๐‘ฅ + 3| + ๐ถ 8. Hitunglah integral tentu dari โˆซ (๐‘ฅ4 + 5๐‘ฅ + 1 ๐‘ฅ3) 4 1 ๐‘‘๐‘ฅ โˆซ(๐‘ฅ4 + 5๐‘ฅ + 1 ๐‘ฅ3 ) 4 1 ๐‘‘๐‘ฅ = โˆซ(๐‘ฅ4 + 5๐‘ฅ + ๐‘ฅโˆ’3 ) 4 1 ๐‘‘๐‘ฅ = 1 5 ๐‘ฅ5 + 5 2 ๐‘ฅ2 โˆ’ 1 2 ๐‘ฅโˆ’2 = 1 5 ๐‘ฅ5 + 5 2 ๐‘ฅ2 โˆ’ 1 2๐‘ฅ2 = ( 1 5 . 45 + 5 2 . 42 โˆ’ 1 2.42 ) โˆ’ ( 1 5 . 15 + 5 2 . 12 โˆ’ 1 2.12 ) = ( 1024 5 + 40 โˆ’ 1 32 ) โˆ’ ( 1 5 + 5 2 โˆ’ 1 2 ) = 1024 5 โˆ’ 1 5 โˆ’ 1 32 โˆ’ 4 2 + 40 = 1023 5 โˆ’ 1 32 + 38 = 32736 โˆ’ 5 + 6080 160 = 38811 160 9. Tentukan luas daerah yang dibatasi oleh kurva ๐‘ฆ = ๐‘ฅ2 + 4dan garis ๐‘ฆ = โˆ’๐‘ฅ + 16 ๐‘ฆ1 = ๐‘ฆ2 โ†’ ๐‘ฅ2 + 4 = โˆ’๐‘ฅ + 16 ๐‘ฅ2 + ๐‘ฅ โˆ’ 12 = 0 ( ๐‘ฅ + 4)( ๐‘ฅ โˆ’ 3) = 0 ๐‘ฅ = โˆ’4 ๐‘Ž๐‘ก๐‘Ž๐‘ข ๐‘ฅ = 3 ๐ฟ = โˆซ(โˆ’๐‘ฅ + 16) โˆ’ ( ๐‘ฅ2 + 4) 3 โˆ’4 ๐‘‘๐‘ฅ = โˆซ(โˆ’๐‘ฅ2 โˆ’ ๐‘ฅ + 12) 3 โˆ’4 ๐‘‘๐‘ฅ = โˆ’ 1 3 ๐‘ฅ3 โˆ’ 1 2 ๐‘ฅ2 + 12๐‘ฅ = (โˆ’ 1 3 . 33 โˆ’ 1 2 . 32 + 12.3) โˆ’ (โˆ’ 1 3 . โˆ’43 โˆ’ 1 2 . โˆ’42 + 12. โˆ’4) = (โˆ’9 โˆ’ 9 2 + 36) โˆ’ ( 64 3 โˆ’ 8 โˆ’ 48) = 27 โˆ’ 9 2 โˆ’ 64 3 + 56 = โˆ’ 64 3 โˆ’ 9 2 + 83 = โˆ’128 โˆ’ 27 + 498 6 = 343 6 ๐‘ ๐‘Ž๐‘ก๐‘ข๐‘Ž๐‘› ๐‘™๐‘ข๐‘Ž๐‘  10. Tentukanlah volume benda yang terbentuk dengan memutar mengelilingi sumbu -y dari daerah yang dibatasi oleh ๐‘ฆ = 3๐‘ฅ, ๐‘ฆ = ๐‘ฅ, ๐‘ฆ = 0 dan garis ๐‘ฆ = 3 ๐‘ฆ = 3๐‘ฅ โ†’ ๐‘ฅ = 1 3 ๐‘ฆ ๐‘ฆ = ๐‘ฅ โ†’ ๐‘ฅ = ๐‘ฆ
  • 5. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 5 ๐‘‰ = ๐œ‹ โˆซ( ๐‘ฅ1 2 โˆ’ ๐‘ฅ2 2) 3 0 ๐‘‘๐‘ฆ = ๐œ‹ โˆซ(๐‘ฆ2 โˆ’ ( 1 3 ๐‘ฆ) 2 ) 3 0 ๐‘‘๐‘ฆ = ๐œ‹ โˆซ (๐‘ฆ2 โˆ’ 1 9 ๐‘ฆ2 ) 3 0 ๐‘‘๐‘ฆ = ๐œ‹ โˆซ 8 9 ๐‘ฆ2 3 0 ๐‘‘๐‘ฆ = ๐œ‹ [ 8 9 3 ๐‘ฆ3 ] = ๐œ‹ [ 8 27 ๐‘ฆ3 ] = ๐œ‹ [ 8 27 . 33 โˆ’ 8 27 . 03 ] = ๐œ‹[8 โˆ’ 0] = 8๐œ‹ ๐‘ ๐‘Ž๐‘ก๐‘ข๐‘Ž๐‘› ๐‘ฃ๐‘œ๐‘™๐‘ข๐‘š๐‘’