Find: Using complex integration, prove the inverse Laplace transform of F(s) is sin(2t) L-¹ [F(s)] = 1

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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Given: There is a table of Laplace transform pairs on page 249 of the course text. Item 13 shows
that
1
s²+w²
Suppose you have some transformed function, F(s), where
1
s² + 4
Find: Using complex integration, prove the inverse Laplace transform of F(s) is
L-1
F(s) =
=
1
=
sin wt
L-¹ [F(s)]==sin(2t)
Recall, the inverse Laplace transform is defined as
potico
1
f(t) = L-¹ [F(s)] = 27, ***** F(s)eªds
Jo-100
Note o is a constant value.
Hint: Apply residue integration-the key is to pick a contour that encircles the poles AND ensures
the added part of the contour goes to zero.
Transcribed Image Text:Given: There is a table of Laplace transform pairs on page 249 of the course text. Item 13 shows that 1 s²+w² Suppose you have some transformed function, F(s), where 1 s² + 4 Find: Using complex integration, prove the inverse Laplace transform of F(s) is L-1 F(s) = = 1 = sin wt L-¹ [F(s)]==sin(2t) Recall, the inverse Laplace transform is defined as potico 1 f(t) = L-¹ [F(s)] = 27, ***** F(s)eªds Jo-100 Note o is a constant value. Hint: Apply residue integration-the key is to pick a contour that encircles the poles AND ensures the added part of the contour goes to zero.
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