33. " +9y sin 2x; y(0) = 1, y' (0) = 0 34. y" + y = cos x; y (0) = 1, y'(0) = -1 35. y" - 2y + 2y = x + 1; y(0) = 3, y'(0) = 0 36. y(4) -4y" = x2; y(0) = y'(0) = 1, y" (0) = y(3) (0) = -1 37. (3) -2y"+y' = 1 + xe*; y(0) = y'(0) = 0, y" (0) = 1 38. y" +2y + 2y = sin 3x; y (0) = 2, y'(0) = 0 39. y(3) + y = x + e*; y(0) = 1, y'(0) = 0, y" (0) = 1 40. y(4) - y = 5; y(0) = y'(0) = y" (0) = y(3) (0) = 0 41. Find a particular solution of the equation y(4)-y(3) - y" - y' - 2y = 8x5.

Calculus: Early Transcendentals
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Chapter1: Functions And Models
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Need help with 37 please

U1₂ =
S
sin x dx = -cos x.
solution is
(Do you see why we choose the constants of integration to be zero?) Thus our particular
yp(x) = u₁(x)yı (x) + u₂(x)y2(x)
= (sin x - In [sec x + tan x) cos x + (- cos x) (sin x);
that is,
yp(x) = −(cos x) In [sec x + tan.x].
3.5 Problems
In Problems 1 through 20, find a particular solution yp of the
given equation. In all these problems, primes denote deriva-
tives with respect to x.
33. y" +9y = sin 2x; y (0) = 1, y' (0) = 0
34. y" + y = cos x; y (0) = 1, y' (0) = -1
35. y" - 2y' + 2y = x + 1; y(0) = 3, y'(0) = 0
1. y" + 16y=e³x
3. y" - y' - 6y = 2 sin 3x
5. y" + y + y = sin² x
2. y" - y' - 2y = 3x + 4
4. 4y" + 4y' + y = 3xex
6. 2y" + 4y' + 7y = x²
8. y" - 4y = cosh 2x
36. y(4) - 4y" = x2; y(0) = y'(0) = 1, y" (0) = y(3) (0) = -1
37. y(3) - 2y"+y' = 1 + xe*; y(0) = y'(0) = 0, y" (0) = 1
38. y" + 2y + 2y = sin 3x; y (0) = 2, y'(0) = 0
39. y(3) + y = x + ex; y(0) = 1, y'(0) = 0, y" (0) = 1
40. y(4) - y = 5; y(0) = y'(0) = y" (0) = y(3) (0) = 0
41. Find a particular solution of the equation
-
7. y” – 4y = sinh x
9. y" + 2y' - 3y = 1 + xe*
10. y" +9y = 2 cos 3x + 3 sin 3.x
11. y(3) + 4y
= 3x - 1
y (4) - y(3) - y" - y' - 2y = 8x5.
13. y" + 2y
+ 5y = e* sin x
15. y(5) + 5y (4) - y = 17
12. y(3) + y' = 2 — sin x
14. y(4) - 2y" + y = xex
16. y" +9y = 2x²e³x +5
42. Find the solution of the initial value problem consisting
of the differential equation of Problem 41 and the initial
conditions
17. y" + y = sin x + x cos x
y (0) = y'(0) = y" (0) = y(3) (0) = 0.
18. y(4) – 5y” + 4y = ex -xe2x
19. y(5) + 2y (3) + 2y" = 3x² - 1
20. y(3) - y = e* + 7
43. (a) Write
cos 3x + i sin 3x = e3ix = (cosx + i sin.x)³
In Problems 21 through 30, set up the appropriate form of a
particular solution yp, but do not determine the values of the
coefficients.
by Euler's formula, expand, and equate real and imag-
inary parts to derive the identities
cos³x = cos x+cos3x.
21. y" - 2y' + 2y = e* sin x
22. y(5) - y(3) = ex + 2x² - 5
sin³ x =
sinx-sin 3x.
23. y" + 4y = 3x cos 2x
(b) Use the result of part (a) to find a general solution of
24. y(3) - y" - 12y' = x - 2xe-3x
y" + 4y = cos³x.
25. y" + 3y' + 2y = x(e-* -e-2x)
26. y" - 6y' + 13y = xe³x sin 2x
Use trigonometric identities to find general solutions of the
equations in Problems 44 through 46.
27. y(4) + 5y" + 4y = sin x + cos2x
28. y(4) +9y" = (x² + 1) sin 3x
44. y"+y' + y = sin x sin 3x
29. (D-1)³ (D² - 4)y = xe* + e2x + e-2x
45. y" +9y = sin* x
30. y(4) - 2y" + y = x² cos x
46. y" + y = x cos³x
Solve the initial value problems in Problems 31 through 40.
In Problems 47 through 56, use the method of variation of pa-
rameters to find a particular solution of the given differential
equation.
31. y" + 4y = 2x; y (0) = 1, y'(0) = 2
32. y" + 3y' + 2y = e*; y(0) = 0, y'(0) = 3
196
47. y" + 3y' + 2y = 4e*
49. y" - 4y + 4y = 2e²x
51. y" + 4y = cos 3.x
53. y" +9y = 2 sec 3x
In Problems 58 through 62, a nonhomogeneous second-order
linear equation and a complementary function yc are given.
Apply the method of Problem 57 to find a particular solution
of the equation.
Chapter 3 Linear Equations of Higher Order
=
48. y"-2y'-8y = 3e-2x
50. y” – 4y = sinh 2x
52. y" +9y = sin 3x
54. y" + y = csc² x
Transcribed Image Text:U1₂ = S sin x dx = -cos x. solution is (Do you see why we choose the constants of integration to be zero?) Thus our particular yp(x) = u₁(x)yı (x) + u₂(x)y2(x) = (sin x - In [sec x + tan x) cos x + (- cos x) (sin x); that is, yp(x) = −(cos x) In [sec x + tan.x]. 3.5 Problems In Problems 1 through 20, find a particular solution yp of the given equation. In all these problems, primes denote deriva- tives with respect to x. 33. y" +9y = sin 2x; y (0) = 1, y' (0) = 0 34. y" + y = cos x; y (0) = 1, y' (0) = -1 35. y" - 2y' + 2y = x + 1; y(0) = 3, y'(0) = 0 1. y" + 16y=e³x 3. y" - y' - 6y = 2 sin 3x 5. y" + y + y = sin² x 2. y" - y' - 2y = 3x + 4 4. 4y" + 4y' + y = 3xex 6. 2y" + 4y' + 7y = x² 8. y" - 4y = cosh 2x 36. y(4) - 4y" = x2; y(0) = y'(0) = 1, y" (0) = y(3) (0) = -1 37. y(3) - 2y"+y' = 1 + xe*; y(0) = y'(0) = 0, y" (0) = 1 38. y" + 2y + 2y = sin 3x; y (0) = 2, y'(0) = 0 39. y(3) + y = x + ex; y(0) = 1, y'(0) = 0, y" (0) = 1 40. y(4) - y = 5; y(0) = y'(0) = y" (0) = y(3) (0) = 0 41. Find a particular solution of the equation - 7. y” – 4y = sinh x 9. y" + 2y' - 3y = 1 + xe* 10. y" +9y = 2 cos 3x + 3 sin 3.x 11. y(3) + 4y = 3x - 1 y (4) - y(3) - y" - y' - 2y = 8x5. 13. y" + 2y + 5y = e* sin x 15. y(5) + 5y (4) - y = 17 12. y(3) + y' = 2 — sin x 14. y(4) - 2y" + y = xex 16. y" +9y = 2x²e³x +5 42. Find the solution of the initial value problem consisting of the differential equation of Problem 41 and the initial conditions 17. y" + y = sin x + x cos x y (0) = y'(0) = y" (0) = y(3) (0) = 0. 18. y(4) – 5y” + 4y = ex -xe2x 19. y(5) + 2y (3) + 2y" = 3x² - 1 20. y(3) - y = e* + 7 43. (a) Write cos 3x + i sin 3x = e3ix = (cosx + i sin.x)³ In Problems 21 through 30, set up the appropriate form of a particular solution yp, but do not determine the values of the coefficients. by Euler's formula, expand, and equate real and imag- inary parts to derive the identities cos³x = cos x+cos3x. 21. y" - 2y' + 2y = e* sin x 22. y(5) - y(3) = ex + 2x² - 5 sin³ x = sinx-sin 3x. 23. y" + 4y = 3x cos 2x (b) Use the result of part (a) to find a general solution of 24. y(3) - y" - 12y' = x - 2xe-3x y" + 4y = cos³x. 25. y" + 3y' + 2y = x(e-* -e-2x) 26. y" - 6y' + 13y = xe³x sin 2x Use trigonometric identities to find general solutions of the equations in Problems 44 through 46. 27. y(4) + 5y" + 4y = sin x + cos2x 28. y(4) +9y" = (x² + 1) sin 3x 44. y"+y' + y = sin x sin 3x 29. (D-1)³ (D² - 4)y = xe* + e2x + e-2x 45. y" +9y = sin* x 30. y(4) - 2y" + y = x² cos x 46. y" + y = x cos³x Solve the initial value problems in Problems 31 through 40. In Problems 47 through 56, use the method of variation of pa- rameters to find a particular solution of the given differential equation. 31. y" + 4y = 2x; y (0) = 1, y'(0) = 2 32. y" + 3y' + 2y = e*; y(0) = 0, y'(0) = 3 196 47. y" + 3y' + 2y = 4e* 49. y" - 4y + 4y = 2e²x 51. y" + 4y = cos 3.x 53. y" +9y = 2 sec 3x In Problems 58 through 62, a nonhomogeneous second-order linear equation and a complementary function yc are given. Apply the method of Problem 57 to find a particular solution of the equation. Chapter 3 Linear Equations of Higher Order = 48. y"-2y'-8y = 3e-2x 50. y” – 4y = sinh 2x 52. y" +9y = sin 3x 54. y" + y = csc² x
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