2. Integration By Parts
When an integral is a product of two functions and neither is the
derivative of the other, we integrate by parts.
3. Integration By Parts
When an integral is a product of two functions and neither is the
derivative of the other, we integrate by parts.
udv uv vdu
4. Integration By Parts
When an integral is a product of two functions and neither is the
derivative of the other, we integrate by parts.
udv uv vdu
u should be chosen so that differentiation makes it a
simpler function.
5. Integration By Parts
When an integral is a product of two functions and neither is the
derivative of the other, we integrate by parts.
udv uv vdu
u should be chosen so that differentiation makes it a
simpler function.
dv should be chosen so that it can be integrated
10. e.g. (i) x cos xdx ux v sin x
du dx dv cos xdx
11. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
12. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
13. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx
14. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx u log x
15. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx u log x
dx
du
x
16. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx u log x
dx
du dv dx
x
17. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx u log x vx
dx
du dv dx
x
18. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx u log x vx
x log x dx du
dx
dv dx
x
19. e.g. (i) x cos xdx ux v sin x
x sin x sin xdx du dx dv cos xdx
x sin x cos x c
ii log xdx u log x vx
x log x dx du
dx
dv dx
x
x log x x c
23. 1
iii xe 7 x dx ux
0
du dx dv e 7 x dx
24. 1
1
iii xe dx
7 x
ux v e 7 x
0
7
du dx dv e 7 x dx
25. 1
1
iii xe dx
7 x
ux v e 7 x
0
7
1 1 du dx dv e 7 x dx
xe 7 x e 7 x dx
1 1
7
0 7
0
26. 1
1
iii xe dx
7 x
ux v e 7 x
0
7
1 1 du dx dv e 7 x dx
xe 7 x e 7 x dx
1 1
7
0 7
0
1
1 7 x 1 7 x
xe e
7 49 0
27. 1
1
iii xe dx
7 x
ux v e 7 x
0
7
1 1 du dx dv e 7 x dx
xe 7 x e 7 x dx
1 1
7 0 7
0
1
1 7 x 1 7 x
xe e
7 49 0
1 e 7 1 e 7 0 1
7 49 49
8 7 1
e
49 49
31. iv e x cos xdx u ex
du e x dx dv cos xdx
32. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
33. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
34. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex
35. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex
du e x dx
36. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex
du e x dx dv sin xdx
37. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex v cos x
du e x dx dv sin xdx
38. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex v cos x
e sin x e cos x e cos xdx
x x x
du e x dx dv sin xdx
39. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex v cos x
e sin x e cos x e cos xdx
x x x
du e x dx dv sin xdx
2 e x cos xdx e x sin x e x cos x
40. iv e x cos xdx u ex v sin x
du e x dx dv cos xdx
e sin x e sin xdx
x x
u ex v cos x
e sin x e cos x e cos xdx
x x x
du e x dx dv sin xdx
2 e x cos xdx e x sin x e x cos x
1 1
e x cos xdx e x sin x e x cos x c
2 2
42. Euler’s Formula
When the two functions are a mixture of trig and exponentials,
Euler’s Formula can be useful;
43. Euler’s Formula
When the two functions are a mixture of trig and exponentials,
Euler’s Formula can be useful;
ei cos i sin
44. Euler’s Formula
When the two functions are a mixture of trig and exponentials,
Euler’s Formula can be useful;
ei cos i sin
This leads to;
ei e i ei e i
cos sin
2 2i
47. e x cos xdx
e x cos x i sin x dx e x eix dx
48. e x cos xdx
e x cos x i sin x dx e x eix dx
e
1i x
dx
49. e x cos xdx
e x cos x i sin x dx e x eix dx
e
1i x
dx
1 1i x
e c
1 i
50. e x cos xdx
e x cos x i sin x dx e x eix dx
e
1i x
dx
1 1i x
e c
1 i
1 i x
e cos x i sin x c
2
51. e x cos xdx
e x cos x i sin x dx e x eix dx
e
1i x
dx
1 1i x
e c
1 i
1 i x
e cos x i sin x c
2
ex
cos x i sin x i cos x sin x c
2
52. e x cos xdx
e x cos x i sin x dx e x eix dx
e
1i x
dx
1 1i x
e c
1 i
1 i x
e cos x i sin x c
2
ex
cos x i sin x i cos x sin x c
2
Equating real parts;
ex
e cos xdx 2 cos x sin x c
x
54. OR
e cos xdx 2 e e e dx
x 1 x ix ix
55. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x 1i x
56. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x
1i x
1 1 1i x 1 1i x
e e c
2 1 i 1 i
57. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x
1i x
1 1 1i x 1 1i x
e e c
2 1 i 1 i
1 1 i 1i x 1 i 1i x
e e c
2 2 2
58. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x
1i x
1 1 1i x 1 1i x
e e c
2 1 i 1 i
1 1 i 1i x 1 i 1i x
e e c
2 2 2
e x
1 i eix 1 i e ix
c
2 2 2
59. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x
1i x
1 1 1i x 1 1i x
e e c
2 1 i 1 i
1 1 i 1i x 1 i 1i x
e e c
2 2 2
e x
1 i eix 1 i e ix
c
2 2 2
eix e ix i eix e ix
e x
c
2 2 2
60. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x 1i x
1 1 1i x 1 1i x
e e c
2 1 i 1 i
1 1 i 1i x 1 i 1i x
e e c
2 2 2
e x
1 i eix 1 i e ix
c
2 2 2
e x eix e ix i eix e ix
c
2 2 2
ex eix e ix eix e ix
c
2 2 2i
61. OR
e cos xdx 2 e e e dx
x 1 x ix ix
1
e e dx
2
1i x 1i x
1 1 1i x 1 1i x
e e c
2 1 i 1 i
1 1 i 1i x 1 i 1i x
e e c
2 2 2
e x
1 i eix 1 i e ix
c
2 2 2
e x eix e ix i eix e ix
c
2 2 2
ex eix e ix eix e ix
ex
c cos x sin x c
2 2 2i 2