[IMG]file:///F:/Users/Miika/AppData/Local/Temp/moz-screenshot-1.png[/IMG]Hi,

In the question below I dont understand where the e^(-kt) comes from? In general when I have been using laplace and fourier transforms the answers are in the form 4/(n^3)*(Pi^3) before the series and not an exponential. Any help on how e^(-kt) is derived would be much appriciated.