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

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Review exercises 13 455

22 Calculate the area enclosed byy =x 2 +4 and

y=12−x 2 .

23 Calculate the area enclosed byy = sinx andy = 2x

π .

Solutions

1 (a) x 3 + x2

2 +c

2

(b) 2ln|t|+t 2 +2t+c

(c) z− z3 3 +c

2

(d)

3 t3/2 −2t 1/2 +c

3

(e)

5 x5/3 +x 4 +c

x 3

3 −cosx+1 2 sin2x+x+c

3 (a) 3e x −3e −x +c

(b) e x +e −x +c

(c)

e 4t

2 +t+c

(d) e x + e2x

2 +c

(e) −4e −t + e−2t

2 +c

4 (a) − 1 2 cos2x + 1 2 sin2x+c

(b) −2cost−sint+c

( )∣ (c) 8ln

∣ sec t ∣∣∣∣

+c

2

(d) cos(π −z) − 1 sin(π −2z) +c

2

(e) ln|sec(t +π)|+c

( )

(f) − 2 3 cos3t −6cos t

+c

3

1

5 (a) ln|cosec(3t + π) −cot(3t + π)| +c

3 ( ) ( )∣ (b) 2ln

∣ sec x

2 +1 x ∣∣∣∣

+tan

2 +1 +c

( )∣ (c) 2ln

∣ sin π +t ∣∣∣∣

+c

2

( ) ( )∣ (d) 9ln

∣ cosec y

3 −2 y ∣∣∣∣

−cot

3 −2 +c

(f)

(e) − 1 ln|sin(π −2z)| +c

4

1

ln|sec(2t −π)+tan(2t −π)|+c

3

6 (a) 4sin −1 v+c

(b) 1 2 sin−1 v +c

( )

1 t

(c)

7 tan−1 +c

7

( )

1 t

(d)

10 tan−1 +c

5

(e) sin −1 (2t) +c

( )

1 x

(f)

3 sin−1 +c

2

(g) √ ( )

3tan −1 x

√ +c

3

7 (a) t2 2 −e−t +c (b) 4.3181

8 − 500

π cosπt+c

9 (a) t+c

(b) − cos4t +c

8

1

(c) ln|cosec2t −cot2t|+c

2

1

(d)

2 ln|sin2t|+c

1

(e)

2 ln|sec2t|+c

10 2ln|x|+tan −1 x+c

11

11 (a)

12

38

(d)

3

(b) 0.1972

(e)

14

3

(c)

53

6

(f) 2.3863

12 (a) 17.2933 (b) 3.2765 (c) 15.2630

(d) 3.6269 (e) 0.1321

2

13 (a)

3

(b) −1 (c) 0.6550

(d) 0.9176 (e) 0.0152

14 (a) 0 (b) 0

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