Exam 5: Integrals

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Express ∫464[sin⁡(πx)]dx\int _ { 4 } ^ { 64 } [ \sin ( \pi x ) ] d x as the limit of a sum.

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Let f (x) = 26x2 ^ { 6 x } on the interval [0,1]. Let the interval be divided into three equal subintervals. Find the value of the Riemann sum ∑i=13f(xi∗)Δxi\sum _ { i = 1 } ^ { 3 } f \left( x _ { i } ^ { * } \right) \Delta x _ { i } if each xi∗x _ { i } ^ { * } is the midpoint of its subinterval.

(Multiple Choice)
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Let f(x)=∫0x2t2dt. Find the value of f′(1). f ( x ) = \int _ { 0 } ^ { x ^ { 2 } } t ^ { 2 } d t \text {. Find the value of } f ^ { \prime } ( 1 ) \text {. }

(Multiple Choice)
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Let f(x)=∫1x24−usin⁡u+2duf ( x ) = \int _ { 1 } ^ { x ^ { 2 } } \frac { 4 - u } { \sin u + 2 } d u Find the interval(s) on which f(x)f ( x ) is increasing.

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Let f be a twice differentiable function such that f(0) = 5, f(3) = 1, and f′f ^ { \prime } (3) = −2- 2 . Determine the value of ∫03x⋅f′′(x)dx\int _ { 0 } ^ { 3 } x \cdot f ^ { \prime \prime } ( x ) d x .

(Short Answer)
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Find the value of the integral ∫0x/3sec⁡xtan⁡x(1+sec⁡x)dx\int _ { 0 } ^ { x / 3 } \sec x \tan x ( 1 + \sec x ) d x

(Multiple Choice)
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Below is a table of values for a continuous function f. x -1 -0.5 0 0.5 1 f(x) 2.0 1.5 -1.0 0.5 -3.0 (a) Use the Trapezoidal Rule with n = 4 to approximate ∫−11f(x)dx\int _ { - 1 } ^ { 1 } f ( x ) d x (b) Use Simpson's Rule with n = 4 to approximate ∫−11f(x)dx\int _ { - 1 } ^ { 1 } f ( x ) d x

(Essay)
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If ∫04f(x)dx=5 and ∫04g(x)dx=2, find the value of ∫04f(x)g(x)dx. \int _ { 0 } ^ { 4 } f ( x ) d x = 5 \text { and } \int _ { 0 } ^ { 4 } g ( x ) d x = 2 \text {, find the value of } \int _ { 0 } ^ { 4 } f ( x ) g ( x ) d x \text {. }

(Multiple Choice)
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Evaluate the following integrals: (a) ∫x3e(x4+1)dx\int x ^ { 3 } e ^ { \left( x ^ { 4 } + 1 \right) } d x (b) ∫e(x)xdx\int \frac { e ^ { ( \sqrt { x } ) } } { \sqrt { x } } d x (c) ∫e(1/x)x2dx\int \frac { e ^ { ( 1 / x ) } } { x ^ { 2 } } d x (d) ∫e(arctan⁡x)1+x2dx\int \frac { e ^ { ( \arctan x ) } } { 1 + x ^ { 2 } } d x

(Essay)
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If ∫3b3x2dx=37\int _ { 3 } ^ { b } 3 x ^ { 2 } d x = 37 find the value of b.

(Multiple Choice)
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Use the Comparison Theorem to determine whether ∫0∞1x+1dx\int _ { 0 } ^ { \infty } \frac { 1 } { \sqrt { x } + 1 } d x is convergent or divergent. Justify your answer.

(Short Answer)
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Estimate ∫131x2dx\int _ { 1 } ^ { 3 } \frac { 1 } { x ^ { 2 } } d x using the Midpoint Rule with n = 4. Then use the error bound ∣EM∣≤k(b−a)324n2\left| E _ { M } \right| \leq \frac { k ( b - a ) ^ { 3 } } { 24 n ^ { 2 } } to estimate the accuracy.

(Short Answer)
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Let f(x)=∫05t4dt. Find f′(x)f ( x ) = \int _ { 0 } ^ { 5 } t ^ { 4 } d t . \text { Find } f ^ { \prime } ( x )

(Multiple Choice)
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Suppose f (x) is a increasing function on the interval 1≤x≤41 \leq x \leq 4 . If you estimate ∫14f(x)dx\int _ { 1 } ^ { 4 } f ( x ) d x using right endpoints, explain why the estimate is an overestimate or an underestimate.

(Essay)
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Determine whether each integral is convergent or divergent. Evaluate those that are convergent.(a) ∫021(x−1)2dx\int _ { 0 } ^ { 2 } \frac { 1 } { ( x - 1 ) ^ { 2 } } d x (b) ∫03dx(x−1)2/3dx\int _ { 0 } ^ { 3 } \frac { d x } { ( x - 1 ) ^ { 2 / 3 } } d x (c) ∫0xsec⁡2tdt\int _ { 0 } ^ { x } \sec ^ { 2 } t d t

(Essay)
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Find the value of the integral ∫0x/2cos⁡3xdx\int _ { 0 } ^ { x / 2 } \cos ^ { 3 } x d x

(Multiple Choice)
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Find the value of the integral ∫01x2e−x3dx\int _ { 0 } ^ { 1 } x ^ { 2 } e ^ { - x ^ { 3 } } d x

(Multiple Choice)
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Use Simpson's Rule with n = 4 to approximate the integral ∫131xdx\int _ { 1 } ^ { 3 } \frac { 1 } { x } d x

(Multiple Choice)
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Evaluate the improper integral ∫01x−1/2dx\int _ { 0 } ^ { 1 } x ^ { - 1 / 2 } d x

(Multiple Choice)
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Find the value of the integral ∫02/s14−25x2dx\int _ { 0 } ^ { \sqrt { 2 } / s } \frac { 1 } { \sqrt { 4 - 25 x ^ { 2 } } } d x

(Multiple Choice)
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