2.30 Use the superposition, scale-change, and time-delay theorems along with the transform pairs II (t) → sinc(f), sinc(t) ← II (f), A(t) sinc² (f), and sinc² (t) → A(f) to find Fourier transforms of the following: II (a) x₁ (t) = 11 (1) (b) x2 (t) = 2 sinc[2 (t - 1)] (c) x3 (1) = A (²) 8 (d) x4 (t) = sinc² (1) (e) x5 (t) = 5 sinc [2 (t - 1)] +5 sinc [2 (t + 1)] (1) x (1) = 2A () + 2A (#)