Let
f (t) =
{
7
0 ≤ t ≤ 2π
cos(5t)
2π < t ≤ 4π
e3(t−4π)
t > 4π
(a)
f (t) can be written in the form
g1(t) +
g2(t)U(t −
2π) +
g3(t)U(t −
4π)
where U(t) is the Heaviside function. Enter the
functions g1(t),
g2(t), and
g3(t), into the answer box below (in
that order), separated with commas.
(b)
Compute the Laplace transform of
f (t).