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

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822 Chapter 24 The Fourier transform

Solutions

1 (a)

4(sinω −ωcosω)

ω 3

(b) − 2jsinωπ

1−ω 2

sinωτ j(cosωτ −1)

(c) +

ω ω

(d) −

2jω

α 2 +ω 2

1 ∞ 6

2 (a)

2π −∞ ω 2 (2jωcos2ω −jsin2ω)ejωt dω

(b)

7 (a)

(c)

(d)

1 ∞ 6

2π −∞ ω [sin2ω + (cos2ω −1)j]ejωt dω

π

α e−α|ω|

π

2α [e−α|ω+b| +e −α|ω−b| ]

πe −αb

α

8 F[k] =9,3,−3,3

9 12, −4, −26.5, −0.5, −3.5

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