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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 : Devi Yunita
NPM : 003 14 24
Prodi : TeknikElektronika
Kelas : 1Elektronika A
Semester : 2 (Dua)
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
KawasanIndustri Air KantungSungailiat, 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∫ (π‘₯12
βˆ’
12
π‘₯5 + √π‘₯103
) 𝑑π‘₯
∫(π‘₯12
βˆ’
12
π‘₯5
+ √ π‘₯103
) 𝑑π‘₯
= ∫ π‘₯12
βˆ’ 12π‘₯βˆ’5
+ π‘₯
10
3 𝑑π‘₯
=
1
13
π‘₯13
βˆ’
12
βˆ’4
π‘₯βˆ’4
+
1
13
3
π‘₯
13
3 + 𝐢
=
1
13
π‘₯13
+ 3π‘₯βˆ’4
+
3
13
π‘₯
13
3 + 𝐢
=
1
13
π‘₯13
+
3
π‘₯4
+
3
13
√ π‘₯133
+ 𝐢
2. Hitunglah∫[cos(7π‘₯ βˆ’ 12) + 𝑠𝑒𝑐2(9π‘₯ βˆ’ 15)] 𝑑π‘₯
∫[cos(7π‘₯ βˆ’ 12) + 𝑠𝑒𝑐2(9π‘₯ βˆ’ 15)] 𝑑π‘₯
=
1
7
sin(7π‘₯ βˆ’ 12)+
1
9
tan(9π‘₯ βˆ’ 15) + 𝐢
3. Denganmenggunakancarasubstitusihitunglah∫
π‘₯2
√3+π‘₯3 𝑑π‘₯
∫
π‘₯2
√3 + π‘₯3
𝑑π‘₯
= ∫ π‘₯2
.(3 + π‘₯3)βˆ’
1
2 𝑑π‘₯
𝑒 = 3 + π‘₯3
β†’
𝑑𝑒
𝑑π‘₯
= 3π‘₯2
β†’ 𝑑π‘₯ =
𝑑𝑒
3π‘₯2
∫ π‘₯2
. (3 + π‘₯3)βˆ’
1
2 𝑑π‘₯ = ∫ π‘₯2
. 𝑒
βˆ’
1
2 .
𝑑𝑒
3π‘₯2
=
1
3
∫ 𝑒
βˆ’
1
2 𝑑𝑒 =
1
3
.
1
1
2
𝑒
1
2 + 𝐢
=
2
3
√ 𝑒 + 𝐢 =
2
3
√3 + π‘₯3 + 𝐢
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 3
4. Denganmenggunakancarasubstitusihitunglah∫(2π‘₯ + 2)cos(5π‘₯2
+ 10π‘₯ + 8) 𝑑π‘₯
∫(2π‘₯ + 2)cos(5π‘₯2
+ 10π‘₯ + 8) 𝑑π‘₯
𝑒 = 5π‘₯2
+ 10π‘₯ + 8 β†’
𝑑𝑒
𝑑π‘₯
= 10π‘₯ + 10 β†’ 𝑑π‘₯ =
𝑑𝑒
10π‘₯ + 10
∫(2π‘₯ + 2)cos(5π‘₯2
+ 10π‘₯ + 8) 𝑑π‘₯ = ∫(2π‘₯ + 2).cos 𝑒 .
𝑑𝑒
10π‘₯ + 10
= ∫(2π‘₯ + 2).cos 𝑒 .
𝑑𝑒
5(2π‘₯ + 2)
=
1
5
∫cos 𝑒 𝑑𝑒
=
1
5
sin 𝑒 + 𝐢 =
1
5
sin(5π‘₯2
+ 10π‘₯ + 8) + 𝐢
5. Hitunglah integral parsildari∫ 2π‘₯. sin(12π‘₯ + 4) 𝑑π‘₯
∫2π‘₯. sin(12π‘₯ + 4) 𝑑π‘₯
𝑒 = 2π‘₯ β†’
𝑑𝑒
𝑑π‘₯
= 2 β†’ 𝑑𝑒 = 2𝑑π‘₯
𝑑𝑣 = sin(12π‘₯ + 4) 𝑑π‘₯ β†’ 𝑣 = ∫sin(12π‘₯ + 4) 𝑑π‘₯ = βˆ’
1
12
cos(12π‘₯ + 4)
∫ 𝑒. 𝑑𝑣 = 𝑒. 𝑣 βˆ’ ∫ 𝑣 𝑑𝑒
∫2π‘₯. sin(12π‘₯ + 4) 𝑑π‘₯ = 2π‘₯. βˆ’
1
12
cos(12π‘₯ + 4) βˆ’ ∫ βˆ’
1
12
cos(12π‘₯ + 4). 2𝑑π‘₯
= βˆ’
1
6
π‘₯ cos(12π‘₯ + 4) + 2 [
1
12
12
sin(12π‘₯ + 4)] + 𝐢
= βˆ’
1
6
π‘₯ cos(12π‘₯ + 4) +
1
72
sin(12π‘₯ + 4) + 𝐢
6. Denganmenggunakanbantuantabelhitunglah integral dari∫ π‘₯3
π‘’βˆ’5π‘₯
𝑑π‘₯
+ π‘₯3
(turunan) π‘’βˆ’5π‘₯
(integral)
- 3π‘₯2
βˆ’
1
5
π‘’βˆ’5π‘₯
+ 6π‘₯
1
25
π‘’βˆ’5π‘₯
- 6 βˆ’
1
125
π‘’βˆ’5π‘₯
+ 0
1
625
π‘’βˆ’5π‘₯
= βˆ’
1
5
π‘₯3
π‘’βˆ’5π‘₯
βˆ’
3
25
π‘₯2
π‘’βˆ’5π‘₯
βˆ’
6
125
π‘₯π‘’βˆ’5π‘₯
βˆ’
6
625
π‘’βˆ’5π‘₯
+ 𝐢
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 4
7. Hitung integral fungsirasionaldari∫
3π‘₯
π‘₯2βˆ’2π‘₯βˆ’15
𝑑π‘₯
3π‘₯
π‘₯2 βˆ’ 2π‘₯ βˆ’ 15
=
3π‘₯
(π‘₯ βˆ’ 5)(π‘₯ + 3)
=
𝐴
( π‘₯ βˆ’ 5)
+
𝐡
( π‘₯ + 3)
π‘₯ βˆ’ 5 = 0 β†’ π‘₯ = 5 β†’ 𝐴 =
3.5
(5 + 3)
=
15
8
π‘₯ + 3 = 0 β†’ π‘₯ = βˆ’3 β†’ 𝐡 =
3. βˆ’3
(βˆ’3 βˆ’ 5)
=
9
8
∫
3π‘₯
π‘₯2 βˆ’ 2π‘₯ βˆ’ 15
𝑑π‘₯ = ∫
15
8
( π‘₯ βˆ’ 5)
𝑑π‘₯ + ∫
9
8
( π‘₯ + 3)
𝑑π‘₯
=
15
8
ln| π‘₯ βˆ’ 5| +
9
8
ln| π‘₯ + 3| + 𝐢
8. Hitunglah integral tentudari∫ (π‘₯4
+ 5π‘₯ +
1
π‘₯3)
4
1
𝑑π‘₯
∫(π‘₯4
+ 5π‘₯ +
1
π‘₯3
)
4
1
𝑑π‘₯ = ∫(π‘₯4
+ 5π‘₯ + π‘₯βˆ’3
)
4
1
𝑑π‘₯
=
1
5
π‘₯5
+
5
2
π‘₯2
βˆ’
1
2
π‘₯βˆ’2
=
1
5
π‘₯5
+
5
2
π‘₯2
βˆ’
1
2π‘₯2
= (
1
5
. 45
+
5
2
. 42
βˆ’
1
2.42
) βˆ’ (
1
5
. 15
+
5
2
. 12
βˆ’
1
2.12
)
= (
1024
5
+ 40 βˆ’
1
32
) βˆ’ (
1
5
+
5
2
βˆ’
1
2
)
=
1024
5
βˆ’
1
5
βˆ’
1
32
βˆ’
4
2
+ 40 =
1023
5
βˆ’
1
32
+ 38
=
32736 βˆ’ 5 + 6080
160
=
38811
160
POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG
Tugas 3 MTK2 Page 5
9. Tentukanluasdaerah yang dibatasiolehkurva𝑦 = π‘₯2
+ 4 dan garis 𝑦 = βˆ’π‘₯ + 16
𝑦1 = 𝑦2 β†’ π‘₯2
+ 4 = βˆ’π‘₯ + 16
π‘₯2
+ π‘₯ βˆ’ 12 = 0
( π‘₯ + 4)( π‘₯ βˆ’ 3) = 0
π‘₯ = βˆ’4 π‘Žπ‘‘π‘Žπ‘’ π‘₯ = 3
𝐿 = ∫(βˆ’π‘₯ + 16) βˆ’ ( π‘₯2
+ 4)
3
βˆ’4
𝑑π‘₯
= ∫(βˆ’π‘₯2
βˆ’ π‘₯ + 12)
3
βˆ’4
𝑑π‘₯ = βˆ’
1
3
π‘₯3
βˆ’
1
2
π‘₯2
+ 12π‘₯
= (βˆ’
1
3
. 33
βˆ’
1
2
. 32
+ 12.3) βˆ’ (βˆ’
1
3
. βˆ’43
βˆ’
1
2
. βˆ’42
+ 12. βˆ’4)
= (βˆ’9 βˆ’
9
2
+ 36) βˆ’ (
64
3
βˆ’ 8 βˆ’ 48)
= 27 βˆ’
9
2
βˆ’
64
3
+ 56 = βˆ’
64
3
βˆ’
9
2
+ 83
=
βˆ’128 βˆ’ 27 + 498
6
=
343
6
π‘ π‘Žπ‘‘π‘’π‘Žπ‘› π‘™π‘’π‘Žπ‘ 
10. Tentukanlah volume benda yang
terbentukdenganmemutarmengelilingisumbu-y daridaerah yang
dibatasioleh𝑦 = 3π‘₯, 𝑦 = π‘₯, 𝑦 = 0 dan garis 𝑦 = 3
𝑦 = 3π‘₯ β†’ π‘₯ =
1
3
𝑦
𝑦 = π‘₯ β†’ π‘₯ = 𝑦
𝑉 = πœ‹ ∫( π‘₯1
2
βˆ’ π‘₯2
2)
3
0
𝑑𝑦
= πœ‹ ∫(𝑦2
βˆ’ (
1
3
𝑦)
2
)
3
0
𝑑𝑦 = πœ‹ ∫ (𝑦2
βˆ’
1
9
𝑦2
)
3
0
𝑑𝑦
= πœ‹ ∫
8
9
𝑦2
3
0
𝑑𝑦 = πœ‹ [
8
9
3
𝑦3
]
= πœ‹ [
8
27
𝑦3
] = πœ‹ [
8
27
. 33
βˆ’
8
27
. 03
]
= πœ‹[8 βˆ’ 0] = 8πœ‹ π‘ π‘Žπ‘‘π‘’π‘Žπ‘› π‘£π‘œπ‘™π‘’π‘šπ‘’

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Tugas mtk 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 : Devi Yunita NPM : 003 14 24 Prodi : TeknikElektronika Kelas : 1Elektronika A Semester : 2 (Dua) POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG KawasanIndustri Air KantungSungailiat, 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∫ (π‘₯12 βˆ’ 12 π‘₯5 + √π‘₯103 ) 𝑑π‘₯ ∫(π‘₯12 βˆ’ 12 π‘₯5 + √ π‘₯103 ) 𝑑π‘₯ = ∫ π‘₯12 βˆ’ 12π‘₯βˆ’5 + π‘₯ 10 3 𝑑π‘₯ = 1 13 π‘₯13 βˆ’ 12 βˆ’4 π‘₯βˆ’4 + 1 13 3 π‘₯ 13 3 + 𝐢 = 1 13 π‘₯13 + 3π‘₯βˆ’4 + 3 13 π‘₯ 13 3 + 𝐢 = 1 13 π‘₯13 + 3 π‘₯4 + 3 13 √ π‘₯133 + 𝐢 2. Hitunglah∫[cos(7π‘₯ βˆ’ 12) + 𝑠𝑒𝑐2(9π‘₯ βˆ’ 15)] 𝑑π‘₯ ∫[cos(7π‘₯ βˆ’ 12) + 𝑠𝑒𝑐2(9π‘₯ βˆ’ 15)] 𝑑π‘₯ = 1 7 sin(7π‘₯ βˆ’ 12)+ 1 9 tan(9π‘₯ βˆ’ 15) + 𝐢 3. Denganmenggunakancarasubstitusihitunglah∫ π‘₯2 √3+π‘₯3 𝑑π‘₯ ∫ π‘₯2 √3 + π‘₯3 𝑑π‘₯ = ∫ π‘₯2 .(3 + π‘₯3)βˆ’ 1 2 𝑑π‘₯ 𝑒 = 3 + π‘₯3 β†’ 𝑑𝑒 𝑑π‘₯ = 3π‘₯2 β†’ 𝑑π‘₯ = 𝑑𝑒 3π‘₯2 ∫ π‘₯2 . (3 + π‘₯3)βˆ’ 1 2 𝑑π‘₯ = ∫ π‘₯2 . 𝑒 βˆ’ 1 2 . 𝑑𝑒 3π‘₯2 = 1 3 ∫ 𝑒 βˆ’ 1 2 𝑑𝑒 = 1 3 . 1 1 2 𝑒 1 2 + 𝐢 = 2 3 √ 𝑒 + 𝐢 = 2 3 √3 + π‘₯3 + 𝐢
  • 3. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 3 4. Denganmenggunakancarasubstitusihitunglah∫(2π‘₯ + 2)cos(5π‘₯2 + 10π‘₯ + 8) 𝑑π‘₯ ∫(2π‘₯ + 2)cos(5π‘₯2 + 10π‘₯ + 8) 𝑑π‘₯ 𝑒 = 5π‘₯2 + 10π‘₯ + 8 β†’ 𝑑𝑒 𝑑π‘₯ = 10π‘₯ + 10 β†’ 𝑑π‘₯ = 𝑑𝑒 10π‘₯ + 10 ∫(2π‘₯ + 2)cos(5π‘₯2 + 10π‘₯ + 8) 𝑑π‘₯ = ∫(2π‘₯ + 2).cos 𝑒 . 𝑑𝑒 10π‘₯ + 10 = ∫(2π‘₯ + 2).cos 𝑒 . 𝑑𝑒 5(2π‘₯ + 2) = 1 5 ∫cos 𝑒 𝑑𝑒 = 1 5 sin 𝑒 + 𝐢 = 1 5 sin(5π‘₯2 + 10π‘₯ + 8) + 𝐢 5. Hitunglah integral parsildari∫ 2π‘₯. sin(12π‘₯ + 4) 𝑑π‘₯ ∫2π‘₯. sin(12π‘₯ + 4) 𝑑π‘₯ 𝑒 = 2π‘₯ β†’ 𝑑𝑒 𝑑π‘₯ = 2 β†’ 𝑑𝑒 = 2𝑑π‘₯ 𝑑𝑣 = sin(12π‘₯ + 4) 𝑑π‘₯ β†’ 𝑣 = ∫sin(12π‘₯ + 4) 𝑑π‘₯ = βˆ’ 1 12 cos(12π‘₯ + 4) ∫ 𝑒. 𝑑𝑣 = 𝑒. 𝑣 βˆ’ ∫ 𝑣 𝑑𝑒 ∫2π‘₯. sin(12π‘₯ + 4) 𝑑π‘₯ = 2π‘₯. βˆ’ 1 12 cos(12π‘₯ + 4) βˆ’ ∫ βˆ’ 1 12 cos(12π‘₯ + 4). 2𝑑π‘₯ = βˆ’ 1 6 π‘₯ cos(12π‘₯ + 4) + 2 [ 1 12 12 sin(12π‘₯ + 4)] + 𝐢 = βˆ’ 1 6 π‘₯ cos(12π‘₯ + 4) + 1 72 sin(12π‘₯ + 4) + 𝐢 6. Denganmenggunakanbantuantabelhitunglah integral dari∫ π‘₯3 π‘’βˆ’5π‘₯ 𝑑π‘₯ + π‘₯3 (turunan) π‘’βˆ’5π‘₯ (integral) - 3π‘₯2 βˆ’ 1 5 π‘’βˆ’5π‘₯ + 6π‘₯ 1 25 π‘’βˆ’5π‘₯ - 6 βˆ’ 1 125 π‘’βˆ’5π‘₯ + 0 1 625 π‘’βˆ’5π‘₯ = βˆ’ 1 5 π‘₯3 π‘’βˆ’5π‘₯ βˆ’ 3 25 π‘₯2 π‘’βˆ’5π‘₯ βˆ’ 6 125 π‘₯π‘’βˆ’5π‘₯ βˆ’ 6 625 π‘’βˆ’5π‘₯ + 𝐢
  • 4. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 4 7. Hitung integral fungsirasionaldari∫ 3π‘₯ π‘₯2βˆ’2π‘₯βˆ’15 𝑑π‘₯ 3π‘₯ π‘₯2 βˆ’ 2π‘₯ βˆ’ 15 = 3π‘₯ (π‘₯ βˆ’ 5)(π‘₯ + 3) = 𝐴 ( π‘₯ βˆ’ 5) + 𝐡 ( π‘₯ + 3) π‘₯ βˆ’ 5 = 0 β†’ π‘₯ = 5 β†’ 𝐴 = 3.5 (5 + 3) = 15 8 π‘₯ + 3 = 0 β†’ π‘₯ = βˆ’3 β†’ 𝐡 = 3. βˆ’3 (βˆ’3 βˆ’ 5) = 9 8 ∫ 3π‘₯ π‘₯2 βˆ’ 2π‘₯ βˆ’ 15 𝑑π‘₯ = ∫ 15 8 ( π‘₯ βˆ’ 5) 𝑑π‘₯ + ∫ 9 8 ( π‘₯ + 3) 𝑑π‘₯ = 15 8 ln| π‘₯ βˆ’ 5| + 9 8 ln| π‘₯ + 3| + 𝐢 8. Hitunglah integral tentudari∫ (π‘₯4 + 5π‘₯ + 1 π‘₯3) 4 1 𝑑π‘₯ ∫(π‘₯4 + 5π‘₯ + 1 π‘₯3 ) 4 1 𝑑π‘₯ = ∫(π‘₯4 + 5π‘₯ + π‘₯βˆ’3 ) 4 1 𝑑π‘₯ = 1 5 π‘₯5 + 5 2 π‘₯2 βˆ’ 1 2 π‘₯βˆ’2 = 1 5 π‘₯5 + 5 2 π‘₯2 βˆ’ 1 2π‘₯2 = ( 1 5 . 45 + 5 2 . 42 βˆ’ 1 2.42 ) βˆ’ ( 1 5 . 15 + 5 2 . 12 βˆ’ 1 2.12 ) = ( 1024 5 + 40 βˆ’ 1 32 ) βˆ’ ( 1 5 + 5 2 βˆ’ 1 2 ) = 1024 5 βˆ’ 1 5 βˆ’ 1 32 βˆ’ 4 2 + 40 = 1023 5 βˆ’ 1 32 + 38 = 32736 βˆ’ 5 + 6080 160 = 38811 160
  • 5. POLITEKNIK MANUFAKTUR NEGERI BANGKA BELITUNG Tugas 3 MTK2 Page 5 9. Tentukanluasdaerah yang dibatasiolehkurva𝑦 = π‘₯2 + 4 dan garis 𝑦 = βˆ’π‘₯ + 16 𝑦1 = 𝑦2 β†’ π‘₯2 + 4 = βˆ’π‘₯ + 16 π‘₯2 + π‘₯ βˆ’ 12 = 0 ( π‘₯ + 4)( π‘₯ βˆ’ 3) = 0 π‘₯ = βˆ’4 π‘Žπ‘‘π‘Žπ‘’ π‘₯ = 3 𝐿 = ∫(βˆ’π‘₯ + 16) βˆ’ ( π‘₯2 + 4) 3 βˆ’4 𝑑π‘₯ = ∫(βˆ’π‘₯2 βˆ’ π‘₯ + 12) 3 βˆ’4 𝑑π‘₯ = βˆ’ 1 3 π‘₯3 βˆ’ 1 2 π‘₯2 + 12π‘₯ = (βˆ’ 1 3 . 33 βˆ’ 1 2 . 32 + 12.3) βˆ’ (βˆ’ 1 3 . βˆ’43 βˆ’ 1 2 . βˆ’42 + 12. βˆ’4) = (βˆ’9 βˆ’ 9 2 + 36) βˆ’ ( 64 3 βˆ’ 8 βˆ’ 48) = 27 βˆ’ 9 2 βˆ’ 64 3 + 56 = βˆ’ 64 3 βˆ’ 9 2 + 83 = βˆ’128 βˆ’ 27 + 498 6 = 343 6 π‘ π‘Žπ‘‘π‘’π‘Žπ‘› π‘™π‘’π‘Žπ‘  10. Tentukanlah volume benda yang terbentukdenganmemutarmengelilingisumbu-y daridaerah yang dibatasioleh𝑦 = 3π‘₯, 𝑦 = π‘₯, 𝑦 = 0 dan garis 𝑦 = 3 𝑦 = 3π‘₯ β†’ π‘₯ = 1 3 𝑦 𝑦 = π‘₯ β†’ π‘₯ = 𝑦 𝑉 = πœ‹ ∫( π‘₯1 2 βˆ’ π‘₯2 2) 3 0 𝑑𝑦 = πœ‹ ∫(𝑦2 βˆ’ ( 1 3 𝑦) 2 ) 3 0 𝑑𝑦 = πœ‹ ∫ (𝑦2 βˆ’ 1 9 𝑦2 ) 3 0 𝑑𝑦 = πœ‹ ∫ 8 9 𝑦2 3 0 𝑑𝑦 = πœ‹ [ 8 9 3 𝑦3 ] = πœ‹ [ 8 27 𝑦3 ] = πœ‹ [ 8 27 . 33 βˆ’ 8 27 . 03 ] = πœ‹[8 βˆ’ 0] = 8πœ‹ π‘ π‘Žπ‘‘π‘’π‘Žπ‘› π‘£π‘œπ‘™π‘’π‘šπ‘’