a. The continuoustime signal x(t)=3cos(400t) is sampled with 600Hz. Find the digital angular frequency of the corresponding discrete-time signal x[n]. [13 marks] b. Consider the continuous-time signal x(t)=4cos(100t)+3cos2(200t). II x(t) is sampled with a sampling frequency fsH, express the condition that should be satisfied by the sampling frequency fs in order to ensure the perfect recovery of x(t) from the corresponding discrete-time signal. [03 maiks]