1549312215-Complex_Analysis_for_Mathematics_and_Engineering_5th_edition__Mathews

12.9 • INVER.TING THE LAPLACE TRANSFORM 565

• EXAMPLE 12. 25 Let Y (s) = (s 2 +

4

~~ 82 +

9

). Find e,-t (Y (s)).

Solution Here we have P (s) = 5s and Q (s) = s^4 + 13s^2 + 36 , and the roots