Find the inverse Laplace transform ccL^(-1){(s)/((s+1)^2−4)}.

dizxindlert7

dizxindlert7

Answered question

2022-09-11

Find the inverse Laplace transform L 1 { s ( s + 1 ) 2 4 }
My textbook says that the solution is e t cosh ( 2 t ) 1 2 e t sinh ( t )

Answer & Explanation

Maggie Tanner

Maggie Tanner

Beginner2022-09-12Added 18 answers

Hint:
s ( s + 1 ) 2 2 2 = s ( s 1 ) ( s + 3 ) = 1 4 ( s 1 ) + 3 4 ( s + 3 ) ,
and
L ( e a t ) = 1 s a .
For the textbook solution, it is useful to write the given fraction as
s ( s + 1 ) 2 2 2 = s + 1 1 ( s + 1 ) 2 2 2 = s + 1 ( s + 1 ) 2 2 2 1 2 2 ( s + 1 ) 2 2 2 ,
and note that
L ( e a t cosh ( b t ) ) = s + a ( s + a ) 2 b 2 ,
and
L ( e a t sinh ( b t ) ) = b ( s + a ) 2 b 2 .
Leroy Gray

Leroy Gray

Beginner2022-09-13Added 3 answers

L 1 { s ( s + 1 ) 2 4 }
= L 1 { s + 1 ( s + 1 ) 2 4 } L 1 { 1 ( s + 1 ) 2 4 }
= e t cosh ( 2 t ) 1 2 e t sinh ( 2 t )

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