- #1
skrat
- 748
- 8
Homework Statement
Find Laplace transformation for functions ##f(t)##:
a) ##5cos(7t+\pi /4)##
b) ##e^{3t}sintcost##
Homework Equations
The Attempt at a Solution
a) I know that for ##cos(\omega t)## the laplace is ##\frac{s}{s^2+\omega ^2}## but what can I do with that ##\pi /4## ?
I believe I would have to use this identity ##f(t)^{'}=sF(s)+f(0)## but I don't know how o use it...
Could somebody please show me that?