QUESTION 3 (a) If the Fourier transform of (t) is X(c) = 12 (a+2)[email protected]+6) determine the transform for (-21-1). [5 marks] (b) Based on Figure Q3(b), give the expression for signal xt) in unit step function. From your obtained expression, find the Fourier transform of x(). Then compare your answer using the formula of Fourier transform. x() 10 0 Figure Q3(b) [9 marks] 다. For the linear system in Figure Q3(e), when the input voltage is vr(t) = 2sgn(t) V. the output is v.(t) =-2 + 4(1 – t)u(t)V. Find the output using Fourier Transform when the input is vy(t) = Bte fu(t). h(t) v.) Figure Q30) [11 marks]