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Esercizi settimana 7 - Integrali, Esercizi di Analisi Matematica I

Esercizi relativi all'analisi matematica, in particolare sui integrali indeterminati e determinati. La soluzione per ognuno di essi, inclusi integrali di funzioni elementari e complesse. Inoltre, sono incluse domande relative alla derivata e all'approssimazione numerica di integrali. Utile per gli studenti universitari di matematica per studiare e capire meglio i concetti di integrali.

Tipologia: Esercizi

Pre 2010

Caricato il 29/08/2009

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Mathematical analysis - Exercises
Week #7 - Integrals
1. Evaluate the following indefinite integrals:
(a) Zdx
3
x2
(b) Zln2x
xdx
(c) Zx
1x2dx
(d) Z3x2x1
2x3x22x+ 4dx
(e) Zx3+ 4x23x+ 1
x2dx
(f) Zx+ 3
x+ 1dx
(g) Zx3+ 4x23x+ 1
xdx
(h) Zxx2+ 4 dx
(i) Zln2x
xdx
(j) Zdx
sin xtan x
(k) Ze1
x
x2dx
(l) Zdx
ex+ 1
(m) Ze3 cos 2xsin 2x dx
(n) Zdx
4x2+ 9
(o) Zx
x4+ 3dx
(p) Zdx
ex+ex
(q) Zx+ 3
1x2dx
1
pf3
pf4
pf5

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Mathematical analysis - Exercises

Week #7 - Integrals

  1. Evaluate the following indefinite integrals:

(a)

dx √ (^3) x 2

(b)

ln^2 x x dx

(c)

x 1 − x^2 dx

(d)

3 x^2 − x − 1 2 x^3 − x^2 − 2 x + 4 dx

(e)

x^3 + 4x^2 − 3 x + 1 x^2 dx

(f)

x + 3 x + 1 dx

(g)

x^3 + 4x^2 − 3 x + 1 √ x

dx

(h)

x

x^2 + 4 dx

(i)

ln^2 x x dx

(j)

dx sin x tan x

(k)

e (^1) x x^2 dx

(l)

dx ex^ + 1

(m)

e3 cos 2x^ sin 2x dx

(n)

dx 4 x^2 + 9 (o)

x x^4 + 3 dx

(p)

dx ex^ + e−x (q)

√x^ + 3 1 − x^2

dx

(r)

dx √ 28 − 12 x − x^2 (s)

dx 9 − x^2 (t)

dx √ x^2 + 1

(u)

e^2 x^ − 1 e^2 x^ + 3 dx

(v)

dx x

4 − 9 ln^2 x (w)

x sin x dx

(x)

xex^ dx

(y)

x^2 ln x dx

  1. Evaluate the following definite integrals:

(a)

  1. For each of the following functions, let F 0 (x) =

∫ (^) x

0

f (θ)dθ. Find the equation of the line tangent to the graph of F 0 (x) in the given point x 0. (a) f (x) = x^3 + 1; x 0 = 3

  1. For each of the following functions f (x) and intervals I = [a, b]:
    • Verify that f (x) ≥ 0 ∀x ∈ I
    • Partition I into a chosen partition of at least four intervals P = {x 0 = a, x 1 ,... , xn = b} n ≥ 4
    • Find both upper and lower Riemann’s sums for the chosen partition
    • Compute

∫ (^) b

a

f (x)dx and compare to previous results

(a) f (x) = (1 + x) x

; I = [1, 5]

(b) f (x) = −x^2 − 6 x; I = [− 3 , −1]

(c) f (x) = cos(2πx); I = [−

]

(d) f (x) = log(|x| + 1); I = [1 − e, e − 1]

(w) −x cos x − sin x + C (x) ex(x − 1) + C

(y)

x^3 ln(x) − x^3 9

+ C

  1. (a)

0

|x − 1 |dx =

(b)

0

√ (^3) (x − 1) 2 dx = 9

(c)

0

x 1 +

x dx = 2ln 3

(d)

∫ (^) π 2

0

sen

xdx = 2π

(e)

1

(ex^ − 1)−^ (^12) dx = 2(arc tan(e^2 − 1) (^12) − arc tan(e − 1) (^12)

  1. tangent line is

(a) y − 28 x + 60.75 = 0

  1. (a) f (x) = (1 + x) x

; I = [1, 5], f(x) > 0 because the numerator and denominator are >0 in [1,5]

(b) f (x) = −x^2 − 6 x; I = [− 3 , −1], => f (x) = (−x)(x + 6) > 0 f or|x| > 3

(c) f (x) = cos(2πx); I = [−

], cos(x) = cos(−x); |x| ≤

<=> 2 π|x| = π 2 => cos 2 πx ≥= 0

(d) f (x) = log(|x| + 1); I = [1 − e, e − 1], f (x) > 0 => 1 + |x| ≥ 1 => log(|x| + 1) ≥ 0

  • For function (a) a partition we can choose is P = { 1 , 2 , 3 , 4 , 5 } and then, computing the lower Riemann sum (LRS), then the Upper one (URS) and then the Integral we find

LRS =

U RS =

∫ (^) b

a

f (x)dx = 4 + ln 5 ' 5. 609

  • For function (b), P = {− 3 , − 5 / 2 , − 2 , − 3 / 2 , − 1 }

LRS =

U RS =

∫ (^) b

a

f (x)dx =

  • For function (c), P = {− 4 / 16 , − 2 / 16 , 0 , 2 / 16 , 4 / 16 }

LRS =

U RS =

∫ (^) b

a

f (x)dx =

π

  • For function (d), P = { 1 − e, (1 − e)/ 2 , 0 , (e − 1)/ 2 , e − 1 }

LRS ' 1. 4436 ∫ U RS^ '^3.^7715 b a

f (x)dx = 2

These are the solutions for some chosen partitions.