2 . question details scalcet8 7.1.005. [3805335] cha… · 3/7/2019 assignment previewer 2/21 3 ....
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Question
Chapter 7 Review (14266894)
1234567891011121314151617181920212223242526272829303132333435Due: Tue, Feb 5, 2019 12:00 AM PST
1. -Question Details SCalcET8 7.1.003.MI. [3805119]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
3x cos(8x) dx
2. -Question Details SCalcET8 7.1.005. [3805335]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Let
Then by the equation,
te dt−5t
u = t, dv = e dt du = dt, v = − e .−5t 15
−5t
= − te − = − te + = − te − e + C.te dt−5t 15
−5t − e dt15
−5t 15
−5t 15 e dt−5t 1
5−5t 1
25−5t
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3. -Question Details SCalcET8 7.1.006. [3805429]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Let Then by the equation,
(x − 3)sin(πx) dx
u = x − 3, dv = sin(πx) dx du = dx, v = − cos(πx).1π
(x − 3)sin(πx) dx = − (x − 3)cos(πx) − − cos(πx) dx = − (x − 3)cos(πx) + cos(πx) dx
= − (x − 3)cos(πx) + sin(πx) + C.
1π
1π
1π
1π
1π
1
π2
4. -Question Details SCalcET8 7.1.010. [3805777]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Let Then by the equation,
Note: We could start by using
ln( ) dxx
u = ln( ),x dv = dx du = · dx = dx,1
x
1
2 x12x
v = x.
ln( ) dx = x ln( ) − x · dx = x ln( ) − dx = x ln( ) − x + C.x x 12x
x 12
x 12
ln( ) = ln(x).x 12
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5. -Question Details SCalcET8 7.1.011. [3804880]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Let Then by the equation,
t ln(t) dt4
u = ln(t), dv = t dt du = dt,4 1t
v = t .15
5
t ln(t) dt = t ln(t) − t · dt = t ln(t) − t dt = t ln(t) − t + C.4 15
5 15
5 1t
15
5 15
4 15
5 125
5
6. -Question Details SCalcET8 7.1.015. [3804835]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
First let Then by the equation,
Next let to get
Thus,
where
(ln(x)) dx2
u = (ln(x)) , dv = dx du = 2 ln(x) · dx, v = x.2 1x
I = (ln(x)) dx = x(ln(x)) − 2 x ln(x) · dx = x(ln(x)) − 2 ln(x) dx.2 2 1x
2
U = ln(x), dV = dx dU = dx, V = x1x
ln(x) dx = x ln(x) − x · dx = x ln(x) − dx = x ln(x) − x + C .1x 1
I = x(ln(x)) − 2(x ln(x) − x + C ) = x(ln(x)) − 2x ln(x) + 2x + C,21
2 C = −2C .1
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7. -Question Details SCalcET8 7.1.017.MI. [3805739]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
e sin(3θ) dθ2θ
8. -Question Details SCalcET8 7.2.001.MI. [3805244]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
9 sin (x) cos (x) dx2 3
9. -Question Details SCalcET8 7.2.002. [3804660]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
The symbols and indicate the use of the substitutions and respectively.
sin (θ) cos (θ) dθ3 6
{u = sin(θ), du = cos(θ) dθ}{u = cos(θ), du = −sin(θ) dθ},
sin (θ) cos (θ) dθ = sin (θ) cos (θ) sin(θ) dθ = (1 − cos (θ))cos (θ) sin(θ) dθ
(1 − u )u (−du) = (u − u ) du = u − u + C
= cos (θ) − cos (θ) + C
3 6 2 6 2 6
2 6 8 6 19
9 17
7
19
9 17
7
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10. -Question Details SCalcET8 7.2.003. [3805703]
Evaluate the integral.
Solution or Explanation
The symbols and indicate the use of the substitutions and respectively.
sin (θ) cos (θ) dθπ/2
9 5
0
{u = sin(θ), du = cos(θ) dθ}{u = cos(θ), du = −sin(θ) dθ},
= =
= =
= u − u + u = − + − 0 = =
sin (θ) cos (θ) dθπ/2
9 5
0sin (θ) cos (θ) cos(θ) dθ
π/29 4
0sin (θ)(1 − sin (θ)) cos(θ) dθ
π/29 2 2
0
u (1 − u ) du1
9 2 2
0u (1 − 2u + u ) du
19 2 4
0(u − 2u + u ) du
19 11 13
0
110
10 16
12 114
141
0
110
16
114
21 − 35 + 15210
1210
11. -Question Details SCalcET8 7.2.007. [3805620]
Evaluate the integral.
Solution or Explanation
Click to View Solution
5 cos (θ) dθπ/2
2
0
12. -Question Details SCalcET8 7.2.010. [3805396]
Evaluate the integral.
Solution or Explanation
Click to View Solution
5 sin (t) cos (t) dtπ
2 4
0
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13. -Question Details SCalcET8 7.2.011. [3805206]
Evaluate the integral.
Solution or Explanation
Click to View Solution
9 sin (x) cos (x) dxπ/2
2 2
0
14. -Question Details SCalcET8 7.2.016. [3805568]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
The symbols and indicate the use of the substitutions and respectively.
tan (x) cos (x) dx2 3
{u = sin(x), du = cos(x) dx}{u = cos(x), du = −sin(x) dx},
tan (x) cos (x) dx = cos (x) dx = sin (x) cos(x) dx u du = u + C = sin (x) + C2 3 sin (x)
cos (x)
2
23 2 2 1
33 1
33
15. -Question Details SCalcET8 7.2.021. [3805242]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
4 tan(x) sec (x) dx3
= = [u = sec(x), du = sec(x) tan(x) dx]
= u + C = sec (x) + C
4 tan(x) sec (x) dx3 4 tan(x) sec(x) sec (x) dx2 4u du2
43
3 43
3
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16. -Question Details SCalcET8 7.2.023. [3805150]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
tan (x) dx2
17. -Question Details SCalcET8 7.2.024. [3804992]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
4 tan (x) + tan (x) dx2 4
18. -Question Details SCalcET8 7.2.025. [3805473]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Let Then so
4 tan (x) sec (x) dx4 6
u = tan x. du = sec (x) dx,2
= 4 = 4
= 4 = 4
= 4 u + u + u + C = tan (x) + tan (x) + tan (x) + C.
4 tan (x) sec (x) dx4 6 tan (x) sec (x)(sec (x) dx)4 4 2 tan (x)(1 + tan (x)) (sec (x) dx)4 2 2 2
u (1 + u ) du4 2 2 (u + 2u + u ) du8 6 4
19
9 27
7 15
5 49
9 87
7 45
5
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19. -Question Details SCalcET8 7.2.027. [3805452]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
8 tan (x) sec(x) dx3
20. -Question Details SCalcET8 7.2.032. [3805432]
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
5 tan (x) sec(x) dx2
21. -Question Details SCalcET8 7.2.034. [3804983]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
dφ5 sin(φ)
cos (φ)3
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22. -Question Details SCalcET8 7.3.004. [3804831]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Let where Then and
dxx2
9 − x2
x = 3 sin(θ), −π/2 ≤ θ ≤ π/2. dx = 3 cos(θ) dθ
= = = 3|cos(θ)| = 3 cos(θ).9 − x2 9 − 9 sin (θ)2 9 cos (θ)2
dx = 3 cos(θ) dθ = 9 sin (θ) dθ
= 9 (1 − cos(2θ)) dθ = θ − sin(2θ) + C = θ − (2 sin(θ) cos(θ)) + C
= sin − · · + C = sin − x + C
x2
9 − x29 sin (θ)3 cos(θ)
22
12
92
12
92
94
92
−1 x3
92
x3 3
9 − x2 92
−1 x3
12
9 − x2
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23. -Question Details SCalcET8 7.3.009. [3805016]
Evaluate the integral.
Solution or Explanation
The symbol indicates the use of the substitution
Let so and Then
4
2
dx
(x − 1)2 3/2
{u = sin(θ), du = cos(θ) dθ}.
x = sec(θ), dx = sec(θ) tan(θ) dθ, x = 2 θ = ,π3
x = 4 θ = sec (4).−1
= = dθ
du = − = + = − + .
4
2
dx
(x − 1)2 3/2
sec (4)−1
π/3
sec(θ) tan(θ) dθtan (θ)3
sec (4)−1
π/3
cos(θ)
sin (θ)2
√15/4
√3/2
1
u21u
√15/4
√3/2
−4√15
2√3
415
15 23
3
24. -Question Details SCalcET8 7.3.007. [3804600]
Evaluate the integral.
Solution or Explanation
Let where a > 0 and Then and
Thus,
2 a > 0,a dx
(a + x )2 2 3/20
x = a tan θ, − < θ < .π2
π2
dx = a sec θ dθ, x = 02 θ = 0, x = a θ = .π4
2 = 2 = 2 = = sin θ
= − 0 = .
a dx
(a + x )2 2 3/20
π/4 a sec θ dθ[a (1 + tan θ)]
2
2 2 3/20
π/4 a sec θ dθa sec θ
2
3 30
2
a2 cos θ dθπ/4
0
2
a2
π/4
0
2
a22
2 2
a2 2
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25. -Question Details SCalcET8 7.3.012. [3805385]
Evaluate the integral.
Solution or Explanation
Let so and Thus,
6
0
dt
36 + t2
t = 6 tan(θ), dt = 6 sec (θ) dθ,2 t = 0 θ = 0, t = 6 θ = .π4
= = = sec(θ) dθ = ln(|sec(θ) + tan(θ)|)
= ln(| + 1|) − ln(|1 + 0|) = ln( + 1).
6
0
dt
36 + t2π/4
0
6 sec (θ) dθ2
36 + 36 tan (θ)2
π/4
0
6 sec (θ) dθ6 sec(θ)
2 π/4
0
π/4
0
2 2
26. -Question Details SCalcET8 7.3.013. [3804684]
Evaluate the integral. (Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
dxx
x − 92
3
27. -Question Details SCalcET8 7.3.021. [3804963]
Evaluate the integral.
Solution or Explanation
Click to View Solution
dx0.8 x2
16 − 25x20
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28. -Question Details SCalcET8 7.4.007. [4237557]
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.)
Solution or Explanation
dxxx − 1
4
dx = x + x + x + 1 + dx [by division] = x + x + x + x + ln(|x − 1|) + Cxx − 1
4 3 2 1x − 1
14
4 13
3 12
2
29. -Question Details SCalcET8 7.4.008. [3805457]
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.)
Solution or Explanation
dt5t − 2t + 1
dt = 5 − dt = 5t − 7 ln(|t + 1|) + C5t − 2t + 1
7t + 1
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30. -Question Details SCalcET8 7.4.009. [3805472]
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.)
Solution or Explanation
Multiply both sides by to get
The coefficients of x must be equal and the constant terms are also equal, so and Adding theseequations gives us and hence, Thus,
Another method: Substituting 1 for x in the equation gives
Substituting for x gives
dx17x + 3(4x + 1)(x − 1)
= + .17x + 3(4x + 1)(x − 1)
A4x + 1
Bx − 1
(4x + 1)(x − 1)
17x + 3 = A(x − 1) + B(4x + 1) 17x + 3 = Ax − A + 4Bx + B 17x + 3 = (A + 4B)x + (−A + B).
A + 4B = 17 −A + B = 3.5B = 20 ⇔ B = 4, A = 1.
dx = + dx = ln(|4x + 1|) + 4 ln(|x − 1|) + C.17x + 3(4x + 1)(x − 1)
14x + 1
4x − 1
14
17x + 3 = A(x − 1) + B(4x + 1) 20 = 5B ⇔ B = 4.
− 14
− = − A ⇔ A = 1.54
54
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31. -Question Details SCalcET8 7.4.010. [4237560]
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.)
Solution or Explanation
We have the following.
Multiply both sides by to get the following.
The coefficients of y must be equal and the constant terms are also equal, so and Adding 4 times
the second equation and the first equation gives us and hence, Thus, we have the following.
Another method: Substituting for y in the equation gives Substituting for
y gives
dyy(y + 2)(4y − 1)
= + y(y + 2)(4y − 1)
Ay + 2
B4y − 1
(y + 2)(4y − 1)
y = A(4y − 1) + B(y + 2) y = 4Ay − A + By + 2B y = (4A + B)y + (−A + 2B)
4A + B = 1 −A + 2B = 0.
9B = 1 ⇔ B = 19
A = .29
= + dy = ln(|y + 2|) + · ln(|4y − 1|) + C
= ln(|y + 2|) + ln(|4y − 1|) + C
y dy(y + 2)(4y − 1) y + 2
29
4y − 1
19
29
19
14
29
136
14
y = A(4y − 1) + B(y + 2) = B ⇔ B = .14
94
19
−2
−2 = −9A ⇔ A = .29
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32. -Question Details SCalcET8 7.4.011. [3805207]
Evaluate the integral.
Solution or Explanation
Multiply both sides by to get
The coefficients of x must be equal and the constant terms are also equal, so and Subtracting the second equation from the first gives and hence, Thus,
Another method: Substituting −1 for x in the equation gives
Substituting for x gives
dx1
0
30
6x + 7x + 12
= = + .30
6x + 7x + 1230
(6x + 1)(x + 1)A
6x + 1B
x + 1(6x + 1)(x + 1)
30 = A(x + 1) + B(6x + 1). A + 6B = 0A + B = 30. B = −6, A = 36.
dx = − dx = 6 ln(|6x + 1|) − 6 ln(|x + 1|)
= (6 ln(7) − 6 ln(2)) − 0 = 6 ln .
1
0
30
6x + 7x + 12
1
0
366x + 1
6x + 1
1
0
72
30 = A(x + 1) + B(6x + 1) 30 = −5B ⇔ B = −6.
− 16
30 = A ⇔ A = 36.56
33. -Question Details SCalcET8 7.4.012. [3805788]
Evaluate the integral.
Solution or Explanation
Multiplying both sides by to get
The coefficients of x must be equal and the constant terms are also equal, so and Adding twicethe first equation to the second gives us and hence, Thus,
Another Method: Substituting 4 for x in the equation gives Substituting 2 for x gives
dx1 x − 6
x − 6x + 820
= + .x − 6
x − 6x + 82A
x − 2B
x − 4(x − 2)(x − 4) x − 6 = A(x − 4) + B(x − 2)
x − 6 = Ax − 4A + Bx − 2B x − 6 = (A + B)x + (−4A − 2B).A + B = 1 −4A − 2B = −6.
−A = −2 ⇔ A = 2, B = −1.
= = 2 ln|x − 2| − ln|x − 4|
= (0 − ln 3) − (2 ln 2 − ln 4)
dx1 x − 6
x − 6x + 820
− dx1 2
x − 21
x − 40
1
0
x − 6 = A(x − 4) + B(x − 2) −1 = B.−2 = −A ⇔ A = 2.
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34. -Question Details SCalcET8 7.4.019. [3805083]
Evaluate the integral.
Solution or Explanation
Multiplying both sides by gives
Substituting −1 for x gives Substituting −2 for x gives Equating coefficients of gives so Thus,
dx1
0
x + x + 1
(x + 1) (x + 2)
2
2
= + + .x + x + 1
(x + 1) (x + 2)
2
2A
x + 1B
(x + 1)2C
x + 2(x + 1) (x + 2)2
x + x + 1 = A(x + 1)(x + 2) + B(x + 2) + C(x + 1) .2 2 1 = B.3 = C. x2 1 = A + C = A + 3, A = −2.
dx = + + dx = −2 ln(|x + 1|) − + 3 ln(|x + 2|)
= −2 ln(2) − + 3 ln(3) − (0 − 1 + 3 ln(2)) = + ln .
1
0
x + x + 1
(x + 1) (x + 2)
2
2
1
0
−2x + 1
1
(x + 1)23
x + 21
x + 1
1
0
12
12
2732
35. -Question Details SCalcET8 7.4.023.MI. [3805057]
Evaluate the integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.)
Solution or Explanation
Click to View Solution
dx17
(x − 1)(x + 16)2
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36. -Question Details SCalcET8 7.8.005. [3805388]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
dx∞
8
1
(x − 7)3/2
convergent
divergent
dx = (x − 7) dx = −2(x − 7) [u = x − 7, du = dx]
= + = 0 + 2 = 2. Convergent
∞
8
1
(x − 7)3/2 lim t→∞
t
8
−3/2 lim t→∞
−1/2 t
8
lim t→∞
−2
√t − 7
2
√1
37. -Question Details SCalcET8 7.8.007. [3804786]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
Click to View Solution
dx0 1
5 − 8x−∞
convergent
divergent
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38. -Question Details SCalcET8 7.8.011. [3804756]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
dx∞
0
x2
5 + x3
convergent
divergent
dx = dx = = − = ∞. Divergent∞
0
x2
5 + x3 lim t→∞
t
0
x2
5 + x3 lim t→∞
23
5 + x3t
0lim t→∞
23
5 + t323
39. -Question Details SCalcET8 7.8.013. [3805229]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
Click to View Solution
9xe dx∞ −x
2
−∞
convergent
divergent
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40. -Question Details SCalcET8 7.8.017. [3805665]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
dx∞
1
1
x + x2
convergent
divergent
dx = dx = − dx [partial fractions]
= ln(|x|) − ln(|x + 1|) = ln = ln − ln
= 0 − ln = ln(2). Convergent
∞
1
1
x + x2 lim t→∞
t
1
1x(x + 1)
lim t→∞
t
1
1x
1x + 1
lim t→∞
t
1lim t→∞
xx + 1
t
1lim t→∞
tt + 1
12
12
41. -Question Details SCalcET8 7.8.028. [3805270]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
dx13
0
1
13 − x3
convergent
divergent
dx = (13 − x) dx = − (13 − x) = − (13 − t) − 13
= 13 . Convergent
13
0
1
13 − x3 lim t→13 −
t
0
−1/3 lim t→13 −
32
2/3 t
0lim
t→13 −
32
2/3 2/3
32
2/3
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Name (AID): Chapter 7 Review (14266894)Submissions Allowed: 10Category: HomeworkCode:Locked: NoAuthor: Mkrtchyan, Tigran ( [email protected] )Last Saved: Mar 7, 2019 09:27 AM PSTPermission: ProtectedRandomization: PersonWhich graded: Last
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42. -Question Details SCalcET8 7.8.029. [3804761]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
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dx14 11
x + 24−2
convergent
divergent
43. -Question Details SCalcET8 7.8.031. [3804783]
Determine whether the integral is convergent or divergent.
If it is convergent, evaluate it. (If the quantity diverges, enter DIVERGES.)
Solution or Explanation
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dx3 44
x4−2
convergent
divergent
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