Example 12.10.   Show that  [Graphics:Images/LaplaceTransformMod_gr_144.gif].  

Explore Solution 12.10.

Enter the function  [Graphics:../Images/LaplaceTransformMod_gr_147.gif]  and compute the integral defining   [Graphics:../Images/LaplaceTransformMod_gr_148.gif].  

[Graphics:../Images/LaplaceTransformMod_gr_149.gif]




[Graphics:../Images/LaplaceTransformMod_gr_150.gif]

 

 

 

 

Assuming that f(t) is of exponential order, we have  [Graphics:../Images/LaplaceTransformMod_gr_151.gif]. Then  [Graphics:../Images/LaplaceTransformMod_gr_152.gif],  and the Laplace transform can be computed by the calculation  [Graphics:../Images/LaplaceTransformMod_gr_153.gif].

[Graphics:../Images/LaplaceTransformMod_gr_154.gif]





[Graphics:../Images/LaplaceTransformMod_gr_155.gif]



Aside. We can check this with Mathematica's  result using the LaplaceTransform package.

[Graphics:../Images/LaplaceTransformMod_gr_156.gif]




[Graphics:../Images/LaplaceTransformMod_gr_157.gif]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(c) 2006 John H. Mathews, Russell W. Howell