4.3.(25 pt.) Consider a periodic signala) Determine the fundamental frequency Ohm0 of x(t). b) Find the Fourier series coefficients Xk and carefully plot their magnitude and phase spectra. According to the magnitude line spectrum, at what frequency is the power of x(t) the largest? c) When x(t) is passed through a filter with transfer function H(s), the output of the filter is y(t)=2-2sin(2Pit) Determine the values of H(Ohm) at Ohm = 0, 2Pi. and 4Pi radians/sec.