MATH 2100 C958 Calculus I
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Free MATH 2100 C958 Calculus I Questions
Global max of f(x) = x ln x − x on (0,∞)?
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At x = 1/e
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At x = 1
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At x = e
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None
Explanation
Evaluate limx→3 (x2−9)/(√x−√3) by rationalizing
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6
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3
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9
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12√3
Explanation
Absolute max of f(x) = x3 − 3x on [−2,2]?
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0
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4
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-2
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2
Explanation
Implicit: xy = 1, find dy/dx.
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−x/y
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y/x
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x/y
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−y/x
Explanation

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0
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1
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∞
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Does not exist
Explanation
Explanation
The real-valued function f(x) = √x is defined only for x ≥ 0. Approaching 0 from the left means considering values x < 0, where f(x) is not defined in the real numbers. Because there are no function values for x < 0, the left-hand limit cannot be evaluated and therefore does not exist as a real limit.
Correct Answer
Does not exist
A high school teacher uses L’Hôpital’s rule on limₓ→0 (sin x / x). What is the result?
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0
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1
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∞
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Undefined
Explanation
Explanation:
The limit limₓ→0 (sin x / x) is of the indeterminate form 0/0, so L’Hôpital’s rule applies. Differentiate the numerator and denominator: the derivative of sin x is cos x, and the derivative of x is 1. Therefore, the limit becomes limₓ→0 cos x = cos 0 = 1.
Correct Answer:
1
∫sec2 x dx =?
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tan x + C
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sec x + C
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−cot x + C
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ln∣sec x∣ + C
Explanation
Explanation:
The derivative of tan x is sec2 x, so the antiderivative of sec2 x is:
∫sec2 x dx = tan x +C
Correct Answer:
tan x + C
Evaluate limx→−∞ (√(x2+1))/ x + 1.
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1
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0
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-1
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∞
Explanation
Improper integral:
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∞
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1
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0
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1/2
Explanation
Using simpson's rule
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2
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1.9
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2.1
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0
Explanation
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