3. [40 points] Find the exponential Fourier Series of the following signals (assuming periodic extensions):

{

(b) g(t) = et, -2≤t≤2

(c) g(t) = t³, -1≤t≤1

(d) g(t) = 3 cos (2t) + 7 sin(8t + n/3) + 17 cos(12t - π/6)

(a) g(t) =

-t

if -1 < t < 0,

if 0 < t < 1