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

Fig: 1