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B) Draw the frequency spectrum for signal contains frequencies from 10 to 30 KHz, in two cases as following: 1. Case 1: if the signal is A periodic composite signal" with an amplitude of 10 V. (3 marks) 2. Case 2: if the signal is "A non-periodic composite signal". The peak amplitude is 10 V for the lowest and the highest signals and is 30 V for the 15-KHz signal. Assuming that the amplitudes change gradually from the minimum to the maximum