Laplace Transform

http://img696.imageshack.us/img696/3936/51080238.png

圖片參考：http://img696.imageshack.us/img696/3936/51080238.png


2010-12-13 18:42:03 補充：
另外你可以這樣考慮
L{f(t).u(t-a)} = L{f(t-a+a).u(t-a)}=e^(-as) L{f(t+a)}
L{f(t+3)}=L{t^2+6t+9+2t+6} = {t^2 + 8t +15}