Let f satisfy f(t +T) = f(t) for all t >0 and for some fixed positive number T; f is said to be a periodic with the period T on 0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Attémpt in Progress
Let f satisfy f(t +T) = f(t) for all t > 0 and for some fixed positive
number T; f is said to be a periodic with the period T on 0<t <x.
Then, the Laplace transform of f(t) is given by
T
1
L{f(t)}
e st f(t) dt.
1 – e-sT
Use this fact to find the Laplace transform of the given function.
1, 0<t<9
f(t) = { -1. 9 <t < 18
f(t + 18) = f(t)
L{f(t)}
Transcribed Image Text:Attémpt in Progress Let f satisfy f(t +T) = f(t) for all t > 0 and for some fixed positive number T; f is said to be a periodic with the period T on 0<t <x. Then, the Laplace transform of f(t) is given by T 1 L{f(t)} e st f(t) dt. 1 – e-sT Use this fact to find the Laplace transform of the given function. 1, 0<t<9 f(t) = { -1. 9 <t < 18 f(t + 18) = f(t) L{f(t)}
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