What is the easiest way to find the inverse Laplace of F(s)? F(s)=(1)/((s−1)^2(1−1/s^2))

Kayley Dickson

Kayley Dickson

Answered question

2022-11-08

What is the easiest way to find the inverse Laplace of F(s)? F ( s ) = 1 ( s 1 ) 2 ( 1 1 / s 2 )

Answer & Explanation

erlentzed

erlentzed

Beginner2022-11-09Added 22 answers

This can be rewritten as (another form is also possible):
F ( s ) = s 2 ( s 1 ) 3 ( s + 1 )
Using Partial fractions, this is:
F ( s ) = s 2 ( s 1 ) 3 ( s + 1 ) = 1 8 ( s + 1 ) + 1 8 ( s 1 ) + 3 4 ( s 1 ) 2 + 1 2 ( s 1 ) 3
Now, you can find the inverse laplace transform using the definitions.
We arrive at:
F ( t ) = 1 8 e t ( 2 e 2 t t 2 + 6 e 2 t t + e 2 t 1 )
A second form is possible (of course the ILT is identical):
F ( s ) == s 2 ( s 1 ) 3 ( s + 1 ) = s 2 ( s 1 ) 2 ( s 2 1 )

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