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

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Review exercises 11 405

Solutions

1 (a) 2(5 +x)cos(5 +x) 2

(b) 2cosxe 2sinx

(c) 20(4x +7) 4

(d) 3x 4 cos3x +4x 3 sin3x

(e)

2 (a)

e 4x (4x 3 −3x 2 +44)

(x 3 +11) 2

(f) x 2 sec 2 x +2xtanx

−3xsin3x −2cos3x

(g)

x 3

(h) −e −x (5sin5x +cos5x)

(i) −4tan4x

(j) 2cos4t

−2x

(k)

(x 2 +1) 2

cosx(2x 3 cos2x +3x 2 sin2x) +x 3 sin2xsinx

cos 2 x

whichsimplifiesto 2x 3 cosx +6x 2 sinx

(b) e −x (x 3 sec 2 x −x 3 tanx +3x 2 tanx)

(c)

e 5x (5xsinx +sinx −xcosx)

sin 2 x

3

(d) − 2x+3y

3x+2y

9x 2 +2y 2

(e)

1−4xy

1

8 ,0

4 − 3(1−cosθ)

4sinθ

5 − 2 3 ,0

7 x x (lnx+1)

8 (a) e 2x (2x 3 +3x 2 )

(b) 2xe 2x (2x 2 +6x +3)

(c) 2e 2x (4x 3 +18x 2 +18x +3)

9 (a) e t (tcost+(t+1)sint)

(b) −e −t ((t 2 −2t)cos3t +3t 2 sin3t)

(

)

(c) t 2 e 3t 2 4cos4t

sin4tcos3t +3+ − 3sin3t

t sin4t cos3t

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