sinx 3. lim
sinx 3. lim
sinx 3. lim
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Evaluate each <strong>lim</strong>it.<br />
1. <strong>lim</strong><br />
x→0<br />
2. <strong>lim</strong><br />
x→0<br />
x 2<br />
ln cos x<br />
e x − e −x − 2x<br />
x − sin x<br />
<strong>3.</strong> <strong>lim</strong> (tan x) ln x<br />
x→0 +<br />
4. <strong>lim</strong><br />
x→0<br />
5. <strong>lim</strong><br />
x→1 +<br />
6. <strong>lim</strong><br />
x→0<br />
7. <strong>lim</strong><br />
x→ π −<br />
2<br />
sin x − x cos x<br />
x − sin x<br />
<br />
1 1<br />
−<br />
ln x x − 1<br />
tan x − sin x<br />
x 3<br />
(2x tan x − π sec x)<br />
8. <strong>lim</strong><br />
x→0 +<br />
<br />
1 2<br />
−<br />
x − 1 x2 − 1<br />
9. <strong>lim</strong><br />
x→0 +<br />
10. <strong>lim</strong><br />
x→0<br />
11. <strong>lim</strong><br />
x→0 +<br />
12. <strong>lim</strong><br />
x→∞<br />
e −1/x<br />
x<br />
sin x − x cos x<br />
x 2 sin x<br />
x − arctan x<br />
<br />
<br />
1<br />
1<strong>3.</strong> <strong>lim</strong><br />
x→0 x<br />
1 − 1<br />
x<br />
x3 x − ln |x + 1|<br />
x 2<br />
<br />
14. <strong>lim</strong> 1 − sin<br />
x→∞<br />
1<br />
x<br />
2x<br />
15. <strong>lim</strong><br />
x→∞ x2e −x<br />
16. <strong>lim</strong><br />
x→0 +<br />
<br />
1 1<br />
−<br />
sin x x<br />
<br />
<br />
1 1<br />
17. <strong>lim</strong><br />
−<br />
x→2 ln(x − 1) x − 2<br />
18. <strong>lim</strong><br />
x→0<br />
tan x − x<br />
x − sin x<br />
<br />
<br />
Limits<br />
19. <strong>lim</strong> (1 + 2x)1/x2<br />
x→0 +<br />
20. <strong>lim</strong><br />
x→0 +<br />
1 − sin 2x<br />
x<br />
21. <strong>lim</strong><br />
x→∞ e−x ln x<br />
22. <strong>lim</strong> (1 − 2x)1/x<br />
x→0 +<br />
2<strong>3.</strong> <strong>lim</strong><br />
x→0 −<br />
cos( π<br />
2 − x)<br />
arctan x<br />
x<br />
24. <strong>lim</strong> (1 − 2x)cot<br />
x→0 +<br />
25. <strong>lim</strong><br />
x→ π −<br />
2<br />
26. <strong>lim</strong> x ln<br />
x→∞<br />
sec x + 5<br />
3 tan x<br />
<br />
1 + a<br />
<br />
x<br />
<br />
27. <strong>lim</strong> x − x<br />
x→∞ 2 − 10<br />
28. <strong>lim</strong><br />
x→0 + (ex + x) 1/x<br />
1<br />
29. <strong>lim</strong> x sin<br />
x→∞ x<br />
30. <strong>lim</strong> (sec x − tan x)<br />
π<br />
x→ 2<br />
31. <strong>lim</strong><br />
x→0 + (xx ) x<br />
e<br />
32. <strong>lim</strong><br />
x→0<br />
x − e−x sin x<br />
3<strong>3.</strong> <strong>lim</strong><br />
x→0 +<br />
<br />
1<br />
+ ln x<br />
x<br />
<br />
34. <strong>lim</strong> 1 +<br />
x→∞<br />
1<br />
x 3x<br />
35. <strong>lim</strong><br />
x→0 (1 − 2x) 2/x<br />
36. <strong>lim</strong><br />
x→0 +<br />
37. <strong>lim</strong><br />
x→0<br />
e 2x<br />
x cos x<br />
x − sin x<br />
x − tan x<br />
1<br />
38. <strong>lim</strong> (1 + tan x)<br />
x→0 1/x<br />
<br />
1 x<br />
39. <strong>lim</strong> −<br />
x→1 ln x ln x<br />
40. <strong>lim</strong><br />
x→0 +<br />
ln x<br />
csc x<br />
41. <strong>lim</strong><br />
x→0 +<br />
<br />
2<br />
sin2 x −<br />
<br />
1<br />
1 − cos x<br />
<br />
42. <strong>lim</strong> 1 −<br />
x→∞<br />
3<br />
x x<br />
4<strong>3.</strong> <strong>lim</strong><br />
x→∞<br />
x 3<br />
e x<br />
44. <strong>lim</strong><br />
x→0 (1 + sin x) 1/3x<br />
xe 2x<br />
45. <strong>lim</strong><br />
x→0 4 tan x<br />
46. <strong>lim</strong><br />
x→0 +<br />
<br />
cot x − 1<br />
<br />
x<br />
47. <strong>lim</strong><br />
x→0 +<br />
48. <strong>lim</strong><br />
x→∞<br />
sin x 1<br />
x<br />
x + 2<br />
49. <strong>lim</strong><br />
x→0 +<br />
<br />
1<br />
x<br />
52. <strong>lim</strong><br />
x→− π<br />
2<br />
x<br />
x<br />
1<br />
−<br />
ex <br />
− 1<br />
50. <strong>lim</strong><br />
x→1 +<br />
<br />
1 1<br />
+<br />
ln x x − 1<br />
<br />
51. <strong>lim</strong> 3 −<br />
x→2π<br />
x<br />
csc x<br />
π<br />
<br />
π<br />
+ x sec x<br />
2<br />
5<strong>3.</strong> <strong>lim</strong><br />
x→1<br />
1 − x + ln x<br />
1 + cos πx<br />
csc x<br />
54. <strong>lim</strong> (1 + 3x)<br />
x→0
55. <strong>lim</strong><br />
x→ π −<br />
2<br />
56. <strong>lim</strong><br />
x→ π −<br />
2<br />
57. <strong>lim</strong><br />
x→0<br />
(sec x − tan x)<br />
(cos x) ln cos x<br />
e 2x − e −2x − 4x<br />
x 2<br />
58. <strong>lim</strong><br />
x→∞ (1 + 8x2 ) 1/x2<br />
59. <strong>lim</strong><br />
x→0<br />
60. <strong>lim</strong><br />
x→0<br />
<br />
1<br />
ln(1 + x)<br />
1 − cos 2x<br />
x 2<br />
61. <strong>lim</strong><br />
x→0 (1 + x) 1/x<br />
62. <strong>lim</strong><br />
x→ π<br />
2<br />
cot x − cos x<br />
x 2<br />
6<strong>3.</strong> <strong>lim</strong> (1 + 2x)1/x<br />
x→0 +<br />
64. <strong>lim</strong><br />
x→0 +<br />
ln tan 2x<br />
ln sin 3x<br />
65. <strong>lim</strong><br />
x→0 (e x + x) 1/x<br />
66. <strong>lim</strong><br />
x→ π −<br />
2<br />
<br />
1<br />
−<br />
x<br />
cos 3x sec 7x<br />
<br />
67. <strong>lim</strong> 1 +<br />
x→∞<br />
3<br />
x<br />
68. <strong>lim</strong><br />
x→0<br />
69. <strong>lim</strong><br />
x→0 +<br />
e x − 1<br />
sin x<br />
ln x<br />
csc x<br />
ln x<br />
70. <strong>lim</strong> x1/<br />
x→0 +<br />
2x<br />
71. <strong>lim</strong> (cot x − ln x)<br />
x→0 +<br />
72. <strong>lim</strong> (sin x)x<br />
x→0 +<br />
7<strong>3.</strong> <strong>lim</strong><br />
x→ π −<br />
2<br />
74. <strong>lim</strong><br />
x→0<br />
(tan x − sec x)<br />
x − sin x<br />
x − tan x<br />
<br />
x<br />
75. <strong>lim</strong><br />
x→∞<br />
76. <strong>lim</strong><br />
x→ π −<br />
2<br />
x − 1<br />
77. <strong>lim</strong><br />
x→−∞ x2 e x<br />
78. <strong>lim</strong><br />
x→0<br />
x/2<br />
<br />
sin x 1<br />
+<br />
cos x x − π<br />
2<br />
sin x − x cos x<br />
x − sin x<br />
2<br />
<br />
79. <strong>lim</strong><br />
x→3− <br />
1<br />
ln(x − 2)<br />
80. <strong>lim</strong><br />
x→0 + (1 + 3x2 ) 1/x2<br />
81. <strong>lim</strong><br />
x→1<br />
x − ex−1 (x − 1) 2<br />
82. <strong>lim</strong><br />
x→∞ x<br />
<br />
π<br />
2<br />
<br />
1<br />
−<br />
x − 3<br />
<br />
− arctan x<br />
x+1 x<br />
8<strong>3.</strong> <strong>lim</strong><br />
x→∞ x + 2<br />
x<br />
84. <strong>lim</strong> xtan<br />
x→0 +<br />
85. <strong>lim</strong> (ln x) tan x<br />
x→0 +<br />
86. <strong>lim</strong><br />
x→0 (1 + sin x) 1/(2x)<br />
sin x + x − π<br />
87. <strong>lim</strong><br />
x→π 1 + cos x<br />
88. <strong>lim</strong><br />
x→0 +<br />
<br />
2<br />
x −<br />
<br />
1<br />
1 − cos x)<br />
89. <strong>lim</strong><br />
x→ π −<br />
2<br />
(2x tan x − π sec x)<br />
90. <strong>lim</strong><br />
x→∞ (ex + x) 1/x
Answers:<br />
1. −2 2. 2 <strong>3.</strong> 0 4. 2 5. 1<br />
2 6. 1<br />
2 7. −2 8. 1<br />
9. 0 10. 1<br />
3 11. 1<br />
3 12. 1<br />
e 1<strong>3.</strong> 1<br />
2 14. 1<br />
e 2 15. 0 16. 0<br />
17. 1<br />
2 18. 2 19. ∞ 20. ∞ 21. 0 22. 1<br />
e 2 2<strong>3.</strong> 1 24. 1<br />
e 2<br />
25. 1<br />
3 26. a 27. 0 28. e 2 29. 1 30. 0 31. 1 32. 2<br />
3<strong>3.</strong> ∞ 34. e 1/3 35. 1<br />
e 4 36. ∞ 37. − 1<br />
2 38. e 39. −1 40. 0<br />
41. 1<br />
2 42. 1<br />
e 3 4<strong>3.</strong> 0 44. e 1/3 45. 1<br />
4 46. 0 47. 1 48. e 2<br />
49. 1<br />
2 50. ∞ 51. e −1/π 52. 1 5<strong>3.</strong> − 1<br />
π 2 54. e 3 55. 0 56. 0<br />
57. 0 58. 1 59. 1<br />
2 60. 2 61. e 62. 0 6<strong>3.</strong> e 2 64. 1<br />
65. e 2 66. 3<br />
7 67. e 6 68. 1 69. 0 70. e 71. ∞ 72. 1<br />
7<strong>3.</strong> 0 74. − 1<br />
2 75. e 1/2 76. 0 77. 0 78. 2 79. 1<br />
2 80. e 3<br />
81. − 1<br />
2 82. 1 8<strong>3.</strong> 1<br />
e 2 84. 1 85. 0 86. e 1/2 87. 0 88. −∞<br />
89. −2 90. e<br />
3