Show that the Fourier transform of f(t) defined by: -3, -a < t < 0 3, f (t) = 0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Show that the Fourier transform of
f(t) defined by:
-3, -a <t <0
f (t) =
3,
0 <t< a
Elsewhere
where a is a positive real number is
6.
F[f(t)]
[1 – cos(aw)]
jw
Hint:
Recall that ele = rcos(0) + jrsin(0)
sin(-x) = – sin(x)
cos(-x) = cos(x)
Transcribed Image Text:Show that the Fourier transform of f(t) defined by: -3, -a <t <0 f (t) = 3, 0 <t< a Elsewhere where a is a positive real number is 6. F[f(t)] [1 – cos(aw)] jw Hint: Recall that ele = rcos(0) + jrsin(0) sin(-x) = – sin(x) cos(-x) = cos(x)
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