# Laplace transform

1. Mar 27, 2009

### marmot

1. The problem statement, all variables and given/known data
(1 pt) Given that

L(cos(5t)/(pi*t)^.5)=exp(-5/s)/sqrt(s)

find the Laplace transform of .

sqrt(t/pi)cos(5t)

2. Relevant equations
I honestly have no idea. There is the integral of f(t)exp(-st) though

3. The attempt at a solution

Ive tried many reasonings. One, I thought that maybe finding the laplace trans of sqrt(t/pi) and replace 1/sqrt(s) with that because I know 1/sqrt(s) is the transform pof 1/sqrt(pi*t). However this is wrong. Can someone give me any pointers? this is the only problem i cant solve in my set!!

2. Mar 27, 2009

### djeitnstine

Try using the convolution theorem