25.08.2021 Views

082-Engineering-Mathematics-Anthony-Croft-Robert-Davison-Martin-Hargreaves-James-Flint-Edisi-5-2017

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Review exercises 14 469

∫ π/3

(b) sintcostdt

0

∫ 3 4

(c) dt

1 e2t ∫

3x−7

(d)

(x −2)(x −3)(x −4) dx

e x

(e)

e x +1 dx

6 Evaluate

∫ 1 3

(a)

0 (e t ) 2 +sintcos2 tdt

∫ 1

(b) 4t 2 e t3 +t(1+t 2 ) 12 dt

0

∫ π

(c) sin 2 ωt +cos 2 ωt + ωdt

0

ω constant

∫ 2 1+t+t 2

(d)

1 t(1+t 2 ) dt

∫ 1

(e) (t+e t )sintdt

0

∫ 3 1+4x

(f)

1 2x +4x 2 dx

7 Calculatethe area undery(x) = 1 +2e2x

x+e 2x fromx=1

tox=3.

8 Evaluate the following integrals:

(a)

(−2t +0.1) 4 dt

(b) (1+x)sinxdx

∫ 2

(c) xsin(1 +x)dx

1

∫ 6 t

(d) √

3 t 2 +1 dt

1

(e)

t 3 +2t 2 +t dt

∫ 5 1

(f)

1 1+e tdt

9 Find

(a)

cost

10+sint dt

1

(c)

t(1+lnt) dt

∫ 1+lnx

(e)

xlnx dx

10 Find

x 3 e x2 dx.

∫ 2sintcost

(b)

1+sin 2 dt

t

(d) 1

e t (1+e −t ) dt

Solutions

1 (a) 2.8819 ×10 9

(b) 2322

(c) −1.2 ×10 36

(d) 2 9 (3t +1)3/2 +c

(9y −2) 18

(e) +c

162

(f) 9.092 ×10 −5

(g) − 1 3 cos(t3 )+c

+1

(h) ex3 +c

3

(i) 0.5009

2

(j)

3

(k) 2 3 (sint)3/2 +c

2 (a) 4.2281 (b) 9.4563

3

(lnt) 2

+c

2

∫ π/2

4 (a) I n−2 = sin n−2 θ dθ

0

π

(c)

2 ,1,0.7854,0.6667

1

5 (a)

3 ln|t3 +1|+c

3

(b)

8

(c) 0.2657

(d) − 1 2 ln|x−2|−2ln|x−3|+5 2 ln|x−4|+c

(e) ln|e x +1|+c

6 (a) 1.5778 (b) 317.3 (c) π(1 + ω)

(d) 1.0149 (e) 1.2105 (f) 0.9730

7 3.8805

(−2t +0.1)5

8 (a) − +c

10

(b) −(1+x)cosx+sinx+c

(c) 0.7957

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!