Let x(t) = 11 cos(7pit - pi/3). In each of the following parts, the discrete-time signal x[n] is obtained by sampling x(t) at a rate fs samples f_s, and the resultant x[n] can be written as x[n] = A cos(omega_1 n + phi) For each part below, determine the values of A, phi, and omega_1 such that 0 lessthanareequalto omega_1 lessthanareequalto pi. In ddition, state whether or not the signal has been over-sampled or under-sampled. a. Sampling frequency is f_s = 9 samples/s. b. Sampling frequency is f_s, = 6 samples/s. c. Sampling frequency is f_s = 3 samples/s.