If the right hand side amplitude spectrum, X(f), of a transmitted signal is as follows: ????(????) = { ?2???? + 4 0 ? ???? ? 1???????????? 2 1???????????? ? ???? ? 2???????????? 0 ???? > 2???????????? Sketch the amplitude spectrum of the transmitted signal, then calculate: a) The 3dB bandwidth b) The essential bandwidth of 80% c) The essential bandwidth of 95%