Q. Calculate the limit: lim (x -> 0) (ln(1 + x)/x) (2023)
-
A.
1
-
B.
0
-
C.
Undefined
-
D.
Infinity
Solution
Using L'Hôpital's Rule, we differentiate the numerator and denominator to find lim (x -> 0) (1/(1 + x)) = 1.
Correct Answer:
A
— 1
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Q. Calculate the limit: lim (x -> 0) (x^2 sin(1/x))
-
A.
0
-
B.
1
-
C.
∞
-
D.
Undefined
Solution
Since |sin(1/x)| ≤ 1, we have |x^2 sin(1/x)| ≤ |x^2|. Thus, lim (x -> 0) x^2 sin(1/x) = 0.
Correct Answer:
A
— 0
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Q. Calculate the limit: lim (x -> 0) (x^3)/(sin(x)) (2023)
-
A.
0
-
B.
1
-
C.
∞
-
D.
Undefined
Solution
Using the fact that sin(x) ~ x as x approaches 0, we find that lim (x -> 0) (x^3)/(sin(x)) = 0.
Correct Answer:
A
— 0
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Q. Calculate the limit: lim (x -> 2) (x^3 - 8)/(x - 2)
Solution
Factoring gives lim (x -> 2) ((x - 2)(x^2 + 2x + 4))/(x - 2) = lim (x -> 2) (x^2 + 2x + 4) = 12.
Correct Answer:
A
— 4
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Q. Calculate the limit: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4) (2023)
Solution
Dividing numerator and denominator by x^2 gives lim (x -> ∞) (3 + 2/x^2)/(5 - 4/x^2) = 3/5.
Correct Answer:
A
— 3/5
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Q. Calculate the limit: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4x + 1) (2023)
Solution
Dividing numerator and denominator by x^2 gives lim (x -> ∞) (3 + 2/x^2)/(5 - 4/x + 1/x^2) = 3/5.
Correct Answer:
A
— 3/5
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Q. Find the limit: lim (x -> 0) (x^3)/(sin(x)) (2023)
-
A.
0
-
B.
1
-
C.
Infinity
-
D.
Undefined
Solution
Using the fact that sin(x) approaches x as x approaches 0, we have lim (x -> 0) (x^3)/(sin(x)) = 0.
Correct Answer:
A
— 0
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Q. Find the limit: lim (x -> ∞) (3x^2 + 2)/(5x^2 - 4x + 1)
-
A.
3/5
-
B.
0
-
C.
1
-
D.
Infinity
Solution
As x approaches infinity, the leading terms dominate. Thus, lim (x -> ∞) (3x^2)/(5x^2) = 3/5.
Correct Answer:
A
— 3/5
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Q. What is the limit: lim (x -> 0) (1 - cos(x))/(x^2)? (2022)
-
A.
0
-
B.
1/2
-
C.
1
-
D.
Undefined
Solution
Using the identity 1 - cos(x) = 2sin^2(x/2), we have lim (x -> 0) (1 - cos(x))/(x^2) = lim (x -> 0) (2sin^2(x/2))/(x^2) = 1/2.
Correct Answer:
B
— 1/2
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Q. What is the limit: lim (x -> 0) (cos(x) - 1)/x^2? (2019)
-
A.
0
-
B.
-1/2
-
C.
1
-
D.
Undefined
Solution
Using the Taylor series expansion for cos(x), we find that lim (x -> 0) (cos(x) - 1)/x^2 = -1/2.
Correct Answer:
B
— -1/2
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Q. What is the limit: lim (x -> 0) (e^x - 1)/x? (2022)
-
A.
1
-
B.
0
-
C.
e
-
D.
Undefined
Solution
Using the derivative of e^x at x = 0, we find that lim (x -> 0) (e^x - 1)/x = 1.
Correct Answer:
A
— 1
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Q. What is the limit: lim (x -> 0) (ln(1 + x)/x)?
-
A.
1
-
B.
0
-
C.
∞
-
D.
Undefined
Solution
Using L'Hôpital's Rule, we differentiate the numerator and denominator to find lim (x -> 0) (1/(1 + x)) = 1.
Correct Answer:
A
— 1
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Q. What is the limit: lim (x -> 0) (tan(3x)/x)?
-
A.
3
-
B.
0
-
C.
1
-
D.
Infinity
Solution
Using the limit lim (x -> 0) (tan(x)/x) = 1, we have lim (x -> 0) (tan(3x)/x) = 3 * lim (x -> 0) (tan(3x)/(3x)) = 3.
Correct Answer:
A
— 3
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Q. What is the limit: lim (x -> 1) (x^2 - 1)/(x - 1)? (2019)
-
A.
0
-
B.
1
-
C.
2
-
D.
Undefined
Solution
Factoring gives (x - 1)(x + 1)/(x - 1), which simplifies to x + 1. Thus, lim (x -> 1) (x + 1) = 2.
Correct Answer:
C
— 2
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